Malicious PDF — malware analysis report

Static analysis result for SHA-256 1976522067c68faa…

MALICIOUS

PDF

113.8 KB Created: 2021-06-30 16:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bfa98a8184ccef1f33e388720f2a8dda SHA-1: 6de4ae90cb7f2502705ee2d837d3b517907ec158 SHA-256: 1976522067c68faa007aac1112d420028059367e2c79ec86178a8e2130eba6cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm on compromised CMS uploads, likely to host malicious PDFs. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pretext, aiming to trick users into calling a provided phone number. No scripts were extracted, but the PDF structure and URL patterns suggest it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bd4e3a9---geralinebofapixupazi.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec292a60a---divik.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03e8d7f55b202409a698553cbcd26d7e/rakuvavelepomaxepa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b37e195---71688126343.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f37ad308c---weverupuvamuxejino.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5177071d0e---mozudotuve.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/372b508f406f36676f0b5062cce8229d/jusomaxunaga.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/4mv26s9vg2j276af9ovt5vac70/xefowixomeso.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/17758102443.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/198d76ff3b559e6f8969886cc7eb3d6c/75549157535.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zuvinozugexul.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3eabdccb3---sosebadulobedobe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63cf419a53---79699246939.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tlvosj0a6odure0osmlfkp4c2q/46116198999.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2d879def2e6708f51f494309a99a9de6/wirusevujolusezalesam.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d26a1bspbn1te5m1iiv4046kdp/49838734313.pdfIn PDF document text
    • http://hkalc.com/userfiles/wavoxiwapojulomi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rd5tel0q1sq7dl8vba8uh0774k/68293173518.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/suwapofonem.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092526987fcb---nulamiwokarovodakonopobu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vitunurojexemupedomin.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kexidipiganemezidosewipus.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/darazo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5292a6663---5941206742.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/as5d4a15kv81ak0j09jia08qs4/vanubilidewevaxukowamimum.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c6ead1c4c---bomunupupor.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zaxagozowupowibugejuzito.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nj4l0lcng0ot00ncfsfa8kdp53/wavugozaxakulijavobunovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=continuing+guarantee+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C7 18384 bytes
SHA-256: 9da31eb0b6ed0f2e15adceeca352a733c7a351f897fb80d5bb8598e346753a7b
font_02_sfnt_off0001a25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A25A 10368 bytes
SHA-256: e786a2a26db0a984c2f99b3b62e72049d6e01535e2538535fcfb80eb1422ebaf