Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9192d3b9f9fe2b3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 13:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a7f4d7e9ba4ed27adbd2e712ef639ed SHA-1: 6155e133517ce8780a91c1a4ab2ad45c58e95edd SHA-256: c9192d3b9f9fe2b3199c5be1e189e56435f64bc59759a79a798dbd010c7f395e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan delivery mechanism. While no scripts were directly extracted, the nature of the links suggests an intent to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ohadalegistrocbarter.com/ckeditor/uploads/files/36857288245.pdf
    • https://ipic.vn/userfiles/file/26677795123.pdf
    • https://rolcsi-bau.hu/userfiles/files/pexemelozedopefa.pdf
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdf
    • http://pincailight.com/zk/UploadFile/file/2021090412311173499.pdf
    • http://j1medical.com/uploaded/file/wogojatonaduzavuxeg.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16141660e8d8b0---babujijelijizojowiler.pdf
    • http://eltdb.com/UserFiles/files/6004396451.pdf
    • http://jarosi.hu/files/file/futorasutipelifivomejunub.pdf
    • https://turdv.ru/SITE/files/editor/file/23355668493.pdf
    • https://esprimagroup.com/userfiles/file/pagupudako.pdf
    • http://drivetripper.com/userfiles2020/files/neworavadow.pdf
    • https://media-get.ru/userfiles/files/kirufileririludajawapadi.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/7143349277.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4baea35660fae26342102624b7c5df68/woxelazufonimuliravosu.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/54642070668.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/amh0lmcafvbqgds1gtfe2jaf96/51286922554.pdf
    • http://tivati.com/uploads/userfiles/file/rujomudetobovogepipitudog.pdf
    • https://robindayne.com/ckfinder/userfiles/files/nivapafugisameninopale.pdf
    • http://bitite.lv/media/txt/122/file/puveleruzesefolutusuze.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/91b10c0d352c0cd91c9b955b4306842b/95635249151.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/vavukokurekafejixego.pdf
    • http://chapelguild.com/images/usr/xedivubi.pdf
    • https://ncsccalgary.com/userfiles/files/21722224188.pdf
    • http://austria-ex.com/images/blog/file/nugejetudizofebitesudiv.pdf
    • http://silver.jo/ckfinder/blanc/files/65123434587.pdf
    • https://wendi101.com/userfiles/file/60225756111.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=batman+the+dark+knight+rises+download+for+android
    • 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_off0000cd52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 16792 bytes
font_01_sfnt_off0000e564.bin
9ef3a14015a244fec3a4675fcc188ea611cb7e437ce97a7f9bc4bdd727ce4d17
pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 17996 bytes
font_02_sfnt_off0001134a.bin
03eb770a2c127f7648b5017428f254c3292c3b720b3a3f3ff1e8aa6f9f40fd73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 11032 bytes