Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93a7f72867dd025…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 23:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46245626eeb9b45edc4e54d2b7239672 SHA-1: 082b6ad438cbff19fb30417a355b31002cd44826 SHA-256: c93a7f72867dd02564e8798aa88098592c087bd5fd062df5a8d7f9ca52330f1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs and the overall structure suggest the document is intended to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec106b6206---katavotim.pdf In PDF document text
    • http://gzhangqin.com/uploadfile/files/selepidisagiraru.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///72088725029.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613509327f6a3---55593409486.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/ruxiwopizaj.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21142735936136ca7c12592.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/sofedutofawabereriwalifi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/73024900033.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/49240893971.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dekuzarexoxaguzule.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/sukexezadudaverapazave.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/delupupiloje.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318dd7b39c5---51546831899.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///kadawakiroperufigefij.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j3p0vuu46dnet0erlllm7ul9od/kewosirudeju.pdfIn PDF document text
    • http://www.pilartangguh.com/file/doruxo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f817b1b9---60632162027.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdfIn PDF document text
    • https://wittnebel.dk/file/kofis.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/mitorukiwibunitigewapu.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/40889659762.pdfIn PDF document text
    • https://petala.gr/userfiles/file/14951402570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bobby+fischer+teaches+chess+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_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 20076 bytes
SHA-256: eb10e75ff673f5c529644044e30a4dc63f47bc46832b7d1ce632da1ecdc69244
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 10872 bytes
SHA-256: 5cadc016ac269f4f1e902659cb560b162ab9cc76a20c5b5d0b2025e67c08e168