Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c9ab644b0cd39…

MALICIOUS

PDF

73.3 KB Created: 2021-06-27 23:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33ade201ad2a7addecd52cc089604cf6 SHA-1: 9219c7bb532e7268a6882dda0d998899b89fea4d SHA-256: a79c9ab644b0cd39fc7a9deb9d17a7c532350d15c1445c4f85b29c64fcb3b28e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=heck+of+it+synonym
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5e5cdddc0c777e353cc3f2971ad768f0/fudasasumipasi.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1ff3ac8f15d86152d4321049f396469d/nuxajupudadamud.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6m2vakls2lermbvm36emr35ur1/xidodoviwedajowagitaluk.pdf
    • http://on-video.com/movies/movie_data/file/vezumebajazaloxejizoxuja.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/61bac9332b2752011a4d43dec37803d1/93817104285.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/23168163802.pdf
    • http://afghansolar.com/userfiles/file/nawobavozoru.pdf
    • https://patoman.ro/ckfinder/userfiles/files/suzaxibusagufimifenuki.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b95d97365---ferowunojefomo.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a1l84gcrvd9gf2ugp88jdnr66e/90562721789.pdf
    • https://vatlieutaphu.com/upload/files/15846246402.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160781f53c444c---jusororufepojituzibiwak.pdf
    • https://heritagecambodiatravel.com/userfiles/file/46791251492.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/434b3901c8f31da7dfdb5e430310d357/levot.pdf
    • https://linhngapt.vn/upload/files/kadukisubigosivibi.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/14511759272.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/14966312978.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b0e3b9251c8c565c5bc046b099b0b854/xikomovut.pdf
    • https://plentis.eu/ckfinder/userfiles/files/nudofuzovegefuraxosupepo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fafb2db7a---1112582866.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mg1lrvi3t8cvsprcv33k444b80/30572765986.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d990950db---pamorutuma.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/74b25e274ae24bf118305410948b35cd/xezikegugesogirisi.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a989967bc6---3682282994.pdf
    • http://auapp.ch/userfiles/files/62674406600.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_off0000ba70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 16792 bytes
font_01_sfnt_off0000d282.bin
fd8d186a291e822d280ade1f0fb086bf53ffe1de44342bfe15a20bda0a6997e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 17856 bytes
font_02_sfnt_off000100a9.bin
af479a73ade563c3b4a5256a0b811380f721b84769afa40c6febd9a2606276bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10388 bytes