Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff94d3f178f24838…

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 17:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c86b1a9f0f66494fbea4761a3a65af0 SHA-1: fbdc071258392f8899e0b3b2e231b193cb3985e0 SHA-256: ff94d3f178f24838759fc96af1ef8a8597a4582f68bc8fca82b2f79c5fc6c787
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7af03e63d20874b42a274b166d64e4e0/wuvovejajo.pdf In PDF document text
    • http://mmckno2010.zkosuchdol.info/files/75126554251.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/11db8859bbc7d26e9e05cefbd3c09713/50691352426.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8176c9b78f375d546f6944bff1b4f651/95654426872.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0709deae---38973999584.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/483bvfokm9n8h87v3jf4h0ao86/fotozimebuxe.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/zovofupep.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nosomeduselosutum.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85150408104.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea610fbdf---vujodigewutinaj.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/27831971405.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/84490366417.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tc7tv4te4ugnu6jjl34jum8b57/74586848021.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ce24f04f7---rageweto.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2d050717c2f53fd8d4b3094e7d829063/xoxax.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/80799671996.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c149eeacf2---tevitazawedaveziba.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qeig99ci8e8kd2o06e4our9p4v/jujesebidevubolukapex.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cabda2e4c---58901299814.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foxub.pdfIn PDF document text
    • https://asiabiru.com/contents//files/voginulo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c61e8b88---sufulajolajaloxeli.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8f3a4a49---vowubikuzowokezibegirofev.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/zexopozogaxamized.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dr0asq4uq0hp2q6mtlid7e3ghv/39780079847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=snow+storm+superhero+mod+apk+hack+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 11040 bytes
SHA-256: a5b6af01b49ce03d82f6e72ceb65603aa61ecde096c9a2e46389ea2f99f74a31
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 16992 bytes
SHA-256: 4a4372b21f9fe0bd608464bb9ad8757f6bf31df16678569149f420bbcb595645

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