Malicious PDF — malware analysis report

Static analysis result for SHA-256 210b4f7c7d0ca8ba…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 18:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88d23dc3d668603ae08d5645094603ed SHA-1: 07a24ded4d524bac5273b107f0e5a0d6cf201556 SHA-256: 210b4f7c7d0ca8ba523f88469935295b47dc09837c3d1e48093359b6316ec24b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xinpayflow.com/ckfinder/userfiles/files/98427148132.pdf In PDF document text
    • http://bannermaul.com/userData/board/file/xixujure.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/11974013656.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/zerekatotododiwipemeduw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86cbd1a09a01ba77aa62002615160b8f/28959100344.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d0bce5c4---mefolutijagefomewugomedo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/pepitatunutudamuza.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/gikuxajerufe.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/21700044158.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/27097006861.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0icgas4at5tjb9nqmpifsd7f61/tarujoxuxe.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/98700767560.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b1b388cc3---nivisiwagikubid.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/52197160617.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/katebased.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2a11a065567248f743bb3c04e4f0afdd/59706499530.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/semujevekowad.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/428a5a81432b560332fcb45b626a1c55/37876466213.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0fc0d7233d6ca3b4ca61e22c40c7bfe/lujobunovosagigo.pdfIn PDF document text
    • http://usagimatur.com/files/others/65802312864.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/risavoronuduludipapo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1d66448387fba97a2afb00fca160759e/15808093449.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/wizetetav.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1885353---19873508344.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ab3e33e5205034f2e333061bb6cca89/26678559709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kilimo+cha+pilipili+kichaa+pdfPDF 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 17720 bytes
SHA-256: 96246551b35ad403d5c16fe87c1aa507d8ce885efc84345c9c0b7c9559b7137b
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10368 bytes
SHA-256: 39d22a6709c583c940378829f18317f4520e797b9833ad2c5ef346784d86f779

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