Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d9ff1a1284616…

MALICIOUS

PDF

81.5 KB Created: 2021-08-18 13:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e37f6d97908d3ac14cb7cf788880e3b2 SHA-1: 4c93c452bce9f81475c924864811ece20acec4dc SHA-256: 6f1d9ff1a12846164a2c0bfeae8cb0cccd7fba324c441f75a275e056238fa674
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://clubsportedinburgh.org/userfiles/files/fuvagafixiwowez.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4206f8093b---robonipagevevizakusawe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/1705525886.pdfIn PDF document text
    • https://aedwea.com/upload/foto/muxojase.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33936b7d00---meketifonagazavutamape.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vuvelumapavemuvafazes.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/63f38ff6077b256c18a6d6e01e9ec725/38391995221.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e74e9ab66de7d55666853b1692bb278c/najevewu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacb61169---51306643206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1721bfed4---sopogef.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ef323d86883c3ba1a081ee0cb2492cc8/zefizavaditosumozixa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqgsmtm0l37cnabosr5ckc4ti2/miselolow.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4540fa77ea---febasopatolaxilejegogo.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lefefapoxofaj.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/totekazuzigotadigageme.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lixovabigozixa.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/93196687392.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/duvobiwamokivigagub.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ad36d990c94bd56b79e87608a6dadc36/fozizawosowoxu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/165414d8f5575ab1fc55e3964c170db3/90866518058.pdfIn PDF document text
    • https://media-get.com/userfiles/files/68569929303.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/novozapufok.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d0d2542b39da0700458cd481d0855036/28361199705.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/rodoba.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/volujegaxoperufawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cam+chat+apps+for+iosPDF 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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 16836 bytes
SHA-256: cddf53b5aacba4e51d960fc1dc2ba3e221e0372c294c378cde1dba85c3634d23
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10496 bytes
SHA-256: a198935eccf6d7231011f9214dd5d440f0a16ebbe300e1eb517f2f8eed92c0f0
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1