Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d2353bf27b9b8c…

MALICIOUS

PDF

83.2 KB Created: 2021-06-08 21:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63de496071be232f668b54d488ae3b77 SHA-1: 7ef3c64150f48d436d87ba70b4fdaec5c6a983a8 SHA-256: 92d2353bf27b9b8c716952f807375108eb8f166e60e13908414bde0b212c13c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=can+vei+la+lauzeta+mover+lyrics
    • http://bungefamily.com/clients/5233/File/gisititozuzebibodori.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01ab62707---20176146570.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/971574b1d3b33bca8047d5eb72de2f99/tejemefige.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8665cffc---23600871645.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6fe2e66647ef2bbc45c473801444d625/luligi.pdf
    • http://cnex.cc/images/blog//file/3676835665.pdf
    • http://computerdoki.hu/user/file/67448608523.pdf
    • https://daaeportrett.no/upload/file/90524444669.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084eace7e045---762006868.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6bc0cac13c57d4ff205f0703d340459f/82451524860.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5ad53bcaf6d0c92da98b630e3fa80d6b/19096149856.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad096604a7---puluk.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/iiiop451g9bh5f6l1ildfkr2di/32508022443.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1af3e7b60ef4771bf069a67a38c191af/lidebef.pdf
    • https://aslimitada.com/userfiles/file/29968629479.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c50b2a18---84335119454.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f33f17d5---dologolukikevoleduvewitov.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_off0000fea5.bin
2991f65570d8c96ca6b4b0d4384e6d39d07fc708c37cd91fecd6b47d31c593b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 5064 bytes
font_01_sfnt_off00010fd4.bin
b7265506f293c49f2ad2bf7ff4328b2b6d12d5273b6b07e4999428720dbeccc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 15796 bytes

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