Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3a8c7a8079629e…

MALICIOUS

PDF

97.9 KB Created: 2021-09-05 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad5f84627150f85711d1aa0bb548cb6e SHA-1: dcefb4e996a3449d29b2df0b9c2127d6cf46591e SHA-256: cb3a8c7a8079629ede5dbeaed8e64c9afda8e53d9b5dae90dc311a7a6cb12555
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially a callback phishing lure. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs, many hosted on disposable or compromised domains, suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself likely contains embedded links or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://soosekszer.hu/upload/files/lezeg.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e921965c13---35770931199.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a6df592fe1c597927879cb99efec83c/napilubumixif.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608647f26abdb---97005997033.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/kobefimubom.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/48123544816.pdfIn PDF document text
    • https://promise-land.com/upload/file/70948426766.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/688qfegkeec9lieuurruqrduf3/97269421224.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e56a14405---dinogadunukubutawofix.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/de7f160d2ae9bdae744d067af42fa37d/vopotogulojotifire.pdfIn PDF document text
    • https://onwater.my/uploads/file/37176692859.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/wedixejaworujo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5a2aad99---ridagarebomivijule.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/54670025333.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/28926720365.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/74203096301.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/munizimidebuva.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lixiwatavut.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/74190371013.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210802_7EC034F49816FD90.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/lanutumojuxugaw.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88733359539.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/87010121378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gerbera+flower+cultivation+in+kerala+pdfPDF 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_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 10968 bytes
SHA-256: edc50085e9dbb2cea210de02ae9e56f401df772d33218f0053de7a7ba1997dbd
font_01_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14777 18696 bytes
SHA-256: cca92bbe432096fbf0db25003a2f85a999eae446afc683564c4dad3bc276f991

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