Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf5750981d6ca88…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 18:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aff4acdec29b66fe9dedcdb9df6b6e1f SHA-1: 1e1593c445d179109a066a09996ea6816548496c SHA-256: cdf5750981d6ca88775d245a2a0123e4d678875e85b87e526398262197502b1e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=realtor+license+pa PDF link annotation
    • http://polskienarty.pl/data/aktualnosci_imgs/file/14472795536.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac82677b8---6853118449.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vodozilevalakafejew.pdfIn PDF document text
    • https://partnermind.cz/images/files/memavorased.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gadowukobatofewa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083fcbed7b---tebevibufifuzamebiveruk.pdfIn PDF document text
    • http://absigorta.com/E/file/wepabevokin.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///pejefulubavugaf.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091004ff18b5---funuxujuliwovuwusebupo.pdfIn PDF document text
    • http://splogservice.ru/content/file/dawufapagokaxinidomefetuk.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e1f157d6330b5535e414a8c4da8383f7/nebedalitixirimoz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3ac5ea20---59266394742.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/vikosoxek.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083263934583---xilixinilaletato.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/43e7452c5db58559ada1e307ff7746a9/kapolipaliwuluditepake.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/27223041807.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/74033556718.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///ruperagebafotorugonebofuf.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/gutasusamubekiwoxusi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/38596895438.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2dff1c0bfa9dfdb7083c5da02e76b98e/63088383027.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/bowesutawetoniwevelug.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d80ce742---wugadugukusilodepep.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/mumamuviluzodejig.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b80eb7b0530---80862501582.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_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10412 bytes
SHA-256: 622f260b1273f5113cae129174da0d65868b6d53c5c6f7f760db896c7a3b945e
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 18272 bytes
SHA-256: 87010a8e99a856b3935ca239015e77a5c274e3f15e29d9b3902dd4559b6765a5

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