Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf7c394dfd78120…

MALICIOUS

PDF

82.4 KB Created: 2021-07-04 01:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c1d1cd7f8b2aa88c099247574ed5fd4 SHA-1: cf4ad85598af93f4ebd947421f17ad0703700b18 SHA-256: 9cf7c394dfd781206aad3d165f1915808e458c49f1ece8f6014fbdee08439ca3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' further suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a886d13d2ae---26739308887.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e81d20b04---demonozudusumatemup.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/31343330e768328fe4472f8fd23b15ea/xizif.pdf
    • http://amirafouad.com/uploaded_files/file/95871285505.pdf
    • http://rc-modeller.se/images/file///sugakowelel.pdf
    • https://beauty-full.ru/uploads/files/xafugo.pdf
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/45769285322.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f632134c17f334ba68262a7f8f7a61f4/87934260327.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a1266625---xuwubodewivazela.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gk4p6cobkn464cfq3pqj5mi7sb/furiku.pdf
    • http://canphantich.net/Images_upload/files/namenifafixa.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b7fe3223---37768889668.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/26dbb1558f5386621b2b489a3967a32a/mepevugozigox.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7940790ebe---wevufukidivuweburiso.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607904fb14692---89739006401.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6fdic2ken3fq0rg6d0udkqkj4f/89283442807.pdf
    • http://mosjob.ru/images/file/medulediredoxomunada.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/kl2rqg1rrg1kvicmeptrjvsmek/18203378601.pdf
    • https://birutelorasin.com/contents//files/84640754924.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b954f4d---xudedesoribimazobafizakin.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9992701b---54348758078.pdf
    • https://supermagnum-bg.com/userfiles/file/wimepazodaz.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c430c2c03---pasawepadejowamoposibus.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d77lja7lr2pechn66fqqp3huig/tazedeb.pdf
    • http://aucoindeshalles.fr/menu/file/dojudodajexubamelaraxiv.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8f18d753---bobatufuko.pdf
    • http://hndgyl.com/v15/Upload/file/2021625209495488.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+repair+my+power+armor+in+fallout+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd30.bin
5381bc218eadc591d0be7877ad9260cccc9b797d2d2a3fdf0f86da8f47fbbe01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 17544 bytes
font_01_sfnt_off00010abe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
font_02_sfnt_off000122d5.bin
82b11fb478ab3539d3de00140fa07466ca4301dfb193994b80f1dd81ff3affe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 10860 bytes

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