Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc4ab074760e77…

MALICIOUS

PDF

83.0 KB Created: 2021-08-19 01:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e15b7c12bc0da01901ae06560ac16a1 SHA-1: 2c4a1945b3e7d2404e43e9445e97ef400e4c1cb1 SHA-256: a3fc4ab074760e77032a8cb4999fdb9827d99bd9ca2ff0312bca125fd880fd1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9700974db---14543571870.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/f9ind71318g71p7leeqnv8be19/towewitulove.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3175e0d8---87005213262.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/hsolf4pfd7ueer6a4nk13n38et/xaguzozulimozuzisabik.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/misowirufebani.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/64d99e142accca4190f35cf8691f9185/zifewibulezomipo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o18oe3fukesjpunjvqfo80c7kc/95398935924.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161108d90b2800---nuzitisuxogolor.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/95f81326868534c5de109a589d82a7cb/87317265375.pdfIn PDF document text
    • http://altinay-law.com/images/file/wexibuvonagagisifu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/88361454423.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rofigegag.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vugurakefapuxunoj.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hh6060lkjj49o3kj5ufpja3rpl/bizuxa.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/serarulagogenemelonapodil.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f3ec3884---jujojutafudes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0eptnphk9nuotabcpivuder732/55260365241.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0d7c21475cb8e2159bc472ab44405eac/giretogenibarilewaner.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/94980987646.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fbd8da6c8e87c0ab688765d7a10a076/gigit.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/36b7eee6daf3570cc1852624efb04569/varitafagaliwokadilerife.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/wejoxorozovuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=moles+gizmo+answer+key+activity+cPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 10984 bytes
SHA-256: 72e112918ca50472b297e43f3f086b104c6c318fa4e4f83361425b69949f7efc
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 17608 bytes
SHA-256: bcc5dac783effa1ab458afe08239a6036836675a720e0b6a39802515c44b978e

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