Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e1c6d0a1781bfa…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 23:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abe3aeeaa21ebb3c5d0d488981e2ddd9 SHA-1: c22932da240b9b4b9f3a6c05dbaae410ac5ef36c SHA-256: 76e1c6d0a1781bfa36753b5c8dd5411919d9b882f1b8f897cfacadc38036a204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=simple+harmonic+motion+problems+with+solutions
    • http://hoangnamjsc.com/upload/files/12871254960.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/gibar.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/79632383795.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17a0175bc---mawejasuzuwexiximogoxoku.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd255cbfe2---46088259776.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f8052455---67572810499.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892aa804b38---soradebosewowe.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda538f421---11433891360.pdf
    • https://euro-m.si/web/dokumenti/file/vokizasem.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a4eae52e6---53378720042.pdf
    • http://juha.be/_files/file/laxan.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/letazo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a640612c6caf7c9693027c79253008e0/12073705416.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201cfadb2bb---58062686087.pdf
    • http://jnnycc.org/userfiles/file/69366128184.pdf
    • https://alnahamgroup.com/userfiles/file/kiralor.pdf
    • http://unseenadventure.com/userfiles/file/72001723839.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c6fc818e59c9c88209a3b47a9f123e79/26415787749.pdf
    • 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_off0000e7a6.bin
52c49a7deea32254d3c6ea0ee797946a68917fa50c5864452d58f67ce9be4e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 11040 bytes
font_01_sfnt_off000100f1.bin
f9d557d31cf8ed4a5335002698d7b4a10605620c181dde28980b8792eeffe370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 18296 bytes
font_02_sfnt_off0001308d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 16792 bytes

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