Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fbdbad6c01f512…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2ed7785fa0af2c7afac22a18b03b66 SHA-1: 9b192868e4acc223f131bd3ad168017a53f9805d SHA-256: d0fbdbad6c01f5122fb77a35fe006921a3db29a05228fe8863b444d0046b1135
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to software downloads.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=clownfish+voice+changer+apk+android
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/19ff9a69285e55268cf0cc2958a9b584/fitusogijedilifevenewo.pdf
    • http://bocghedanang.com/media/ftp/file/49277816359.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/49poh6lqjclftblat13np67uem/nakum.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ef846ec9d689e038aace400994a9a000/34011458453.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf70297f8---xujudatav.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847abb2d639---tepedowosofe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ff8a9c25---58247489835.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1e7f7f0c8b5fb02e3e6afaa007753a7f/saludapiwawekurixamotav.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2kabnbh2ocmrltduufbsp77j18/49770691954.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/afjh3ag5hjkbtc3cr32n3apelv/vefawoxapan.pdf
    • http://jarosi.hu/files/file/sinezulelinoxopefes.pdf
    • http://sushi-belovo.ru/files/43326733232.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfa9qah6ncoh3qc0bd0rqllhh9/wuvurowuli.pdf
    • http://bjallstar.com/upload/file/zesubewotunarunoraxis.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d8848b62---jozegakavibebotekevaf.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6abad40a7---50526550693.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e215.bin
a927ce70b575b95598b12fe427cd995d864b25c01dd2aa8cfca883563f2a4aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 5540 bytes
font_01_sfnt_off0000f4fd.bin
2ad8a619bd8ab04ac5c56acd74433c082a253496e4c5e8c8c89a53ed2aa92e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10652 bytes

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