Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1856e921447c4f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 18:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d1d2151d4fb70666e8b1c4ab264700f SHA-1: 98c12806ffbbfc55f7a1218c559d0715e794ec41 SHA-256: 8f1856e921447c4f230af701a058c7706ee07de2de3b05764f27d331488ec469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=seasons+trivia+questions+and+answers PDF link annotation
    • http://benthanhsgfarm.net/images/uploads/files/juzuwekojinutumifebe.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/18156576469.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6j84te0g5dl3q25b8e003ga74m/pixonezus.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/juxuzapetakit.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/42510505556.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d03285c7e74---50090296850.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3fkkckoekokvgihiuj9rvis6t7/69063337605.pdfIn PDF document text
    • http://ewtch.com/upload/files/82884572856.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/sejeb.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/31868444997.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/sajuwe.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6916296873f0dd00cce7a20abc16dc77/16091128875.pdfIn PDF document text
    • http://ccshecea.org/upload/files/32925132893.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237c0986ae5---50572517876.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xazibor.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/4996850383.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pquf6eochtpiqudejbh2n7f37a/87701919164.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/resefuzuz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd666bed854---5484748698.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c20d88e7d55620f6e86ebf903f5091a0/zazudisipanovazejizo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3bc778582435e860def023e36fbcb25c/pinife.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a909043dc---mazoroderunegun.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/sepusukopibeto.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/10952011781.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 17948 bytes
SHA-256: 8e718dfe81d4997f2dd1c432ca2d4ec4950fa6aea628a003104b34bd865293eb
font_01_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 10668 bytes
SHA-256: 5b2fff8f92966309c0e4d24136e3c296270364399fbea702ed465344e94b80d2

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