Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aa6dfeafd125c0…

MALICIOUS

PDF

75.4 KB Created: 2021-06-20 06:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f538d0eea154774c81815a6518384b9d SHA-1: 4c7946aefb16097bbd0ca18fe7110c9631294e0d SHA-256: 85aa6dfeafd125c0da118ef81840c3df4538dfd0bbb7671d969384cb3202223f
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains multiple links to compromised WordPress upload storage and disposable hosting, suggesting it is part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number under the guise of a support or billing issue, a common tactic in phishing and scam operations. No scripts were extracted, but the presence of numerous embedded URLs and the callback lure strongly suggest a phishing or social engineering attack.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8a9bb290---73586384660.pdf In PDF document text
    • https://yuss.it/file/jirisawigepewofe.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/59213624156.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/4698207233.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/xokerogigakuzatukum.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ati451cldf0kko0mlm9jmnrgal/24600497969.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999492b7c56---zigatosimejevil.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/53218218107.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/20b433cf522d55309c75e20500094829/ripawadadazilogevufuvexu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nsodnnojinjqmhufa0ei25e854/42411108384.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/opigonufudipinagevuvotum.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/15037432236.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/kemupikin.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff46a03f9d---88681186604.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/23cb80d4e13bdb885f55530e40a02dd5/lubavezulibuxulipuxe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67b91bff8---49919701059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=invincibility+cheat+gta+five+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5508 bytes
SHA-256: 1b4b428d10f892fa993dc0ad34b7f0032c0c72ef4a82b31635f7b655ff87fecd
font_01_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 11160 bytes
SHA-256: 7d541b13a62630c88b03f006bc9a0d4cedf8ef991971ab5240dbf26cbdbb5a91

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