Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffb1ef0164c4b7d…

MALICIOUS

PDF

94.1 KB Created: 2021-07-04 02:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 20abf027ea441620ada1a6baab8083dd SHA-1: 42a02d634f5b7b9df1248e63564f97a75b837119 SHA-256: 2ffb1ef0164c4b7dc00bb1f076e1c8bef08be4c7d6f5210490b11b15cb274a61
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vljainandco.com/userfiles/files/siwurudad.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1cb96b8b7b52579b1e9cd1b3eb970523/felosufajikabefedijumeb.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/24438161259.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae0b643fc---72328932389.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de1db9393---sarodabulusajademusamuvi.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/deselikaf.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7599eacc---nezufinulufa.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0b1vid3vam5f75ksc8hsbina0m/gosinotamibiso.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/zubotufanuxawagagisaja.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15390851269.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed2a6dae2---63285164040.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1b7d46e96d2d52c6820b09e1079b76ce/waxetupi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/85e0fd1612bd924c0fb3bccc2a91316e/22367750465.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/dinabubilemapajuvotixiwem.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9872c56378ff71a62849b49305072845/xobapejatas.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/2gcmjcjra5opft0qtio0urmupn/mimapewikole.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11d87c2a---41896261082.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3ff9438d21f08cc8e0bc1dbd717d7b72/topatu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vitevirabilekuwafitu.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/68959715348.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a54b89fc---soripepo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cb3f3ef5---zodezevebam.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b02f655---konokedizoberurilamupogok.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2cf67f2ee817e9a21dba36f6554af112/lutijafazi.pdfIn PDF document text
    • http://midel.me/userfiles/file/47637560826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+social+construction+of+technological+systems+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_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 17208 bytes
SHA-256: 45fa039dcb7d3ae7f67f5b4e2c375f899eb44bdd773a50caad8023a16efa7216
font_02_sfnt_off000150d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 11244 bytes
SHA-256: be6e2088ef0f6709504127c922abbcb2c579217274f305cae7a822b04b19a380

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