Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f9de4035a7d3d…

MALICIOUS

PDF

79.7 KB Created: 2021-05-24 08:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936411d8b0d94261e2260550c47a68a2 SHA-1: 88ed4d5ca40b4fe7cee52474c728ef842520d59f SHA-256: 786f9de4035a7d3dd93a24672bb36408f4ecef261c2608b39ec3338f3108bd9a
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text fragments that align with scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6ef30e7d71966fa51891d9ce558544f/kenaxaguzopot.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0b52e33e6a730ce87de6a0dd9addf624/4129081739.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bef81f0673a6ebc9cd8ecd6bc263e43/52111062863.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/26b70f7c27b7b641908f819bd309bcaa/45061648940.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6c62db2359e6d0c90b9047164649a8b/xofebuxapesozanomem.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/16f2b5b81a62c13d162fcdc827dba9be/60350007806.pdf
    • http://agnieszkapawlik.com/userfiles/file/35542702510.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/8931821327.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32efa3ba1---zijofumiwes.pdf
    • http://afghansolar.com/userfiles/file/zusidudoguvetenejasedugu.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080927b7f689---xidotesazodufoxojedekediz.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160926a1e2d064---84934055939.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a4201d4ad9ab05baec4cff71ad208ce8/26810347690.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf144f03---98811442350.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893c0e797bf---zugikozob.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070638c4d8d6---wuzusanigudeda.pdf
    • http://asupuro.com/user_data/image//file/38066459051.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rrpt16do5g8lr70f7ttqh3n4q0/giduza.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/40832acb2040123b7840863c1a6f94c1/desukag.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40320b87f---14243803989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=is+spectrum+remote+universal
    • 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://scripts.sil.org/OFL
    • 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_off0000e134.bin
b5b3d3350eb502fbdf3411dd1eda201a310ff052eca7bf6344cba29b57a5ce8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 5076 bytes
font_01_sfnt_off0000f269.bin
e7c0065e4bc47a80cf7d4a92fed31d890c6cc6a7465ce140d83bc7ed7e4f4742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10944 bytes
font_02_sfnt_off00011825.bin
fd3022b6f3d7ed319949cd299b50095150ad632ed1771d636304536ef57a40a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 17216 bytes

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