Malicious PDF — malware analysis report

Static analysis result for SHA-256 3936de9cbc08307c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 05:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 225c6e9b86673bb2a8571345c03da918 SHA-1: f3fe24bf423cd04d875ac78806a3cc129f3f9e3a SHA-256: 3936de9cbc08307cd07101a4ecad0d8cfb3857362cdccc855e5d1b716992be85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick users into making a phone call for fraudulent purposes, aligning with callback phishing or tech-support scam tactics. No scripts were extracted, but the presence of multiple external URLs indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=do+i+need+security+on+my+phone PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d228b499c---momuwuzarukovimu.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/82394386432.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/81697519927.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/6335014430.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/34152758277.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165c325eb3---wirif.pdfIn PDF document text
    • https://grancom.by/upload/docs/19212448075.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/9097077550.pdfIn PDF document text
    • http://melabo.com/upload/files/rutetuvumoxujosufelixagoz.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/ponetasopupukudij.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/75522053205.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/66663821156.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/67810713347.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/83077211976.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/gabevimenugut.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/41523683717.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/16383181268.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlbc1ma060dspm74kpcdk7ji71/35613136197.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/rukidir.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/vubadelefugel.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/takezibag.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/26433338265.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/josabegokojidepifisunaj.pdfIn PDF document text
    • 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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16280 bytes
SHA-256: fc8234e1d9ad367ead6d4333638900c4e1ebc30b4834be20ec084ef47a776d92
font_02_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 10784 bytes
SHA-256: ed311f82c179e88ce70df0059e1db0445c0aef6a98c4b56bcdc76d6e2f1a0e1f

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