Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f4ee9fd733dc1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93b8db2497a0c54158ed783477783750 SHA-1: 1e36d0582aed10d079c5d00aff0a6c41e17f2d82 SHA-256: bd7f4ee9fd733dc123a3893733d3f24c875f5dc6e383a207a057ec57c0a29c12
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide readable content, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747405805c8---jetokitajekupefo.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/zixavokidagujufuw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6a24225b1---13513727019.pdfIn PDF document text
    • http://serting.eu/userfiles/files/19605621880.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/21161789755.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k6mp564216toudbur7f1s58khi/71212915705.pdfIn PDF document text
    • http://nineslash.com/user_file/file/64612014420.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f6c44f91---xitoxamaboxage.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/sosufuxoripinapotimo.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/87407217568.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/itla5ke3cjdb6r0aoh98giqlj5/fuvege.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1bf89252.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gspkr7sgt2travmng4rnrm9mk0/92738039859.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/roteworofowogame.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/27386163691.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/u69hk46kfegjksihmi05qgj5n1/jonofesiropamoxakum.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/513a18f51ebab7c2559779a7813533b4/66351398265.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20334c122b---12607541161.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/gevesoxuvomalakomi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/12454979100.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/narolalifurakogif.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gomajozeje.pdfIn PDF document text
    • http://taumed.kz/upload/2021/08files/210815055949652320ym79r.pdfIn PDF document text
    • http://geotersrl.it/file/71995372846.pdfIn PDF document text
    • https://ivaco.it/file/rodofofolewok.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xukubefedasalosegimosid.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/198d76ff3b559e6f8969886cc7eb3d6c/75549157535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spss+analysis+book+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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 10580 bytes
SHA-256: 510f88b85abaa2cdd57cfc97fb2a9e5cd76cec950dfc28f8094ac71db473b7b3
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 18440 bytes
SHA-256: a63319739bada5028513530fd76c0a05203523d89798f68ab4d21599260eb4cc
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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