Malicious PDF — malware analysis report

Static analysis result for SHA-256 f821271c69a52c15…

MALICIOUS

PDF

91.6 KB Created: 2021-07-04 16:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3dccfb3ed19e36a1f8a68e8b84867a2 SHA-1: c23468735557877ae90509df2709c77a8d8b0b1f SHA-256: f821271c69a52c155e67f5c2bef941f3043e9b2ac8d87b17bcc25eb47c490670
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://crysiq.ru/uplcv?utm_term=cubism+woman+painting
    • http://anvlaw.com/userfiles/file/novuzelolegajeledadixim.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/repisumonixusuwawe.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160801a97188a7---mubawulapajovegego.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/29950a893caa1f85b8512d075624469e/kajisarezilidewaz.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0n2d4cf4f38bi59l7r2k2q469n/nosonipupoj.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b332b941668---kidoxosatigukoto.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77b541afe---73126513329.pdf
    • http://budka39.ru/files/tujewugoxijota.pdf
    • http://gewald.ru/content/Files/90699088060.pdf
    • https://computerzone.pk/file/7069137016.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/63e66330bc81b6e12b1f6eb52d7e0c2a/5266947592.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/122c5c65672d8b48a8678b7808464c18/43441446698.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828d7ec10f6---kemipirapukubepubovewa.pdf
    • http://email-database.info/userfiles/file/semexotemajogalexutada.pdf
    • http://grandinhr.eu/images/user/file/29932824239.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e2d6283dfbc57ac0fa7b4a4a886e5980/93061341021.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/iekksblb3kjtmo9gqsoufjhbe6/32811972964.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d2c25f6ed0c3851461deac9f9ff5ea4b/numomov.pdf
    • http://www.toptehnik.si/images/worogunuruvetababebo.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/fajevujafafiwanikewu.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e24c6e23---88674063225.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fada09f0---foxupoxebunujuw.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d471951da8---11673748845.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/me8nfg6i1aptkq2l4pqqu9qnct/duxikitafifekigogija.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/egf3jed12ge8qm1is6tjgvltbi/29642627094.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eea896abc---wajibotezotixoxobiwowarap.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3c.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16092 bytes
font_01_sfnt_off0001037d.bin
c3ae6aee5b24fb176231847ed1318ff9361f578100f550a5495d325a51d9aaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17616 bytes
font_02_sfnt_off00013068.bin
fa67b523d13a822ea451bb222da09bcd393b194c079781992b8f8edc10f197f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10672 bytes
font_03_sfnt_off000148bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 16792 bytes

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