Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6984f4defc9644a…

MALICIOUS

PDF

85.0 KB Created: 2021-07-27 18:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7932b92f02d9d78bd8981b78a5b81c8 SHA-1: d46cf12e6c733019562e19801c1b8cc035dc89c2 SHA-256: b6984f4defc9644a87eaf0f1468daf04bc19633e63ba041c6eff39c0cc72225b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is part of a phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number for a fraudulent purpose, consistent with a tech-support scam or callback phishing attempt. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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) or Microsoft license-boilerplate 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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab342a17971---19748280219.pdf In PDF document text
    • http://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/fokojeditisutal.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ond5un2s1a0po2c26l167255s9/xadusati.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d6aaa42040fea51ee940d5fd0e9fc8fa/ruseja.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a764e83eb2---38674714390.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/7149740485.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/budumiraroka.pdfIn PDF document text
    • http://zuche0551.com/upload/file/samubuvu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/6784362344.pdfIn PDF document text
    • https://bataretak.com/img/files/file/96348154800.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7e280cfe---warike.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd11e8c64---18700262204.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc562d8b25---5201976750.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f42d98e8---48724133699.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/af915f3573f1b53f8770ae239318a609/85062881121.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/94676781864.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9452a60---dunobeve.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725de3a9008---divufokudepozalap.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080768944d5f---gevujivet.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce1f61ec14950805a7843035a875cd9e/bimixunenurupebunipogokom.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/70044307583.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/12085382452.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/tumunudujuxiruta.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01c92fdf3---95874645837.pdfIn PDF document text
    • http://djpress.pl/Image/files/41181370650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+turn+off+find+my+iphone+from+my+computerPDF 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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 17420 bytes
SHA-256: 3a92f700a7ba91a31179e61457cb7aeb7999b779c8ee67b39f5256ac89089666
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10800 bytes
SHA-256: 01672bea4c35bcca706589bfd24f5a1bba576ab3973f89a247594116fa60fb6f
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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