Malicious PDF — malware analysis report

Static analysis result for SHA-256 f893ca591e06d1a3…

MALICIOUS

PDF

92.9 KB Created: 2021-08-14 17:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0a419da51e211be26b87bfc08cf6e4e2 SHA-1: 8cc243c2afcbb9223a72cece4ebdffa3f623f588 SHA-256: f893ca591e06d1a3a9a0703b632a60a24d96bbb7794ef2e9fac38984892c105c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm suggests it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://basalyemek.com/ckfinder/userfiles/files/31516607075.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/vaposagatigomove.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/sazuperi.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/vadofameniziju.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/60b8e15962e82e774c05f1ddf66515e6/82279185631.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/aad0011afd67e515c209f29e41dc3a0c/disutozalulaxitutugarutu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3oqs2qb2a24sgds0gbn344bnkd/44763734990.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f844f810a3f67d09074a055a0ade6e4/37028905994.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e297ed41c92---dazukebesuk.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092da1f5e118---pekolusejagegudofitis.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rixolupono.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4918699e6---jinudax.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xesuzegofapi.pdfIn PDF document text
    • https://areicon.com/images/file/karijilusiretewitoneno.pdfIn PDF document text
    • http://iworking.vn/uploads/files/34138639898.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/122244165267.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/69757684046.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/98850957681.pdfIn PDF document text
    • http://arslanemlak.com/E/file/kofesigadiwow.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/sivotadusofegapib.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609aa1f986161---17493225984.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xalokasokekibariperira.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/gijuneviwosegudemusu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972393298a6---84133641207.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f62511094---vitivajogotipeburabogar.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160702fec6078c---vovusafilis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=claves+de+activacion+de+office+365+home+premiumPDF 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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 19000 bytes
SHA-256: 4bb73bf58b75ffe00b1dca4404a973e434fe4be0e61a45fcdb0a78f1ed0be446
font_01_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 11556 bytes
SHA-256: 1fd1c951adcaa900617af44a47d2aebcf5d3fec7b690506ac157e1873267c4df
font_02_sfnt_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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