Malicious PDF — malware analysis report

Static analysis result for SHA-256 91812648b0feb6b8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-03 16:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a204c0bcf6ab9b343035244fb96de782 SHA-1: b7c97fd052547c3276f64b9c2256102c81f51fa0 SHA-256: 91812648b0feb6b8ce4bd9b732fdb18bbaeecd3a353934db8eab11c7e84af7dc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, likely for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=conversion+of+pdf+file+to+ms+word PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b7c9baff---pekujozafuduvoperata.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/21862344696.pdfIn PDF document text
    • http://soupworld.de/upload/file/10853555675.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/2861397777.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/momaruza.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vbl9hb9r8aafnhsf55stei5dhu/simozud.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/duxisubuvor.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wobetikelulidedaku.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0e022f600---jifiboraxeriwelugelif.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/waremifewopetasujizijenul.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62407fcfa---tukowuzi.pdfIn PDF document text
    • https://lasanisports.com/files/53135702632.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/bizipujovuvutitutef.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210903_C693CD2AE60A5C2D.pdfIn PDF document text
    • http://klinok-saintp.ru/files/ralebasilowuvef.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/nijavurip.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16079e09d405cf---70720380504.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/73368313738.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/wexiwipexukuxeloti.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/95237153300.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/48264210933.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/777404573.pdfIn PDF document text
    • 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 10680 bytes
SHA-256: c1747c82db378cf2f56e3efc40ae5459fc0991494cd315573c85b4d7190a8495
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 14748 bytes
SHA-256: ddae627638bc2e2dfda0f71edacee4e0538ac33968a68c4f7c44a0b45cbb789a
font_02_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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