Malicious PDF — malware analysis report

Static analysis result for SHA-256 401cb31647177446…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 14:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ee9d133a899346cbd5034f4c3e7b8e5 SHA-1: 5f535c468dc73a6222faf3bf02db48e118f185e2 SHA-256: 401cb316471774466bfceaa02e967ca3a8b42089a38e1fe55dd2e64aca666bb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d022p00j8qfl0ivd6h52ge4ufu/giwabiwe.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3864a3878---vumuteseziwuf.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93417327257.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/88653381513.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///6497619214.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/43134265459.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4be8f21b---52079914543.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c60bcc0a1b6---potejejipukazu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea42a50c42eb30de47a95d202b671566/14065536467.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c628c8815d2---kirifiwovojuruvatufirepem.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/11180044393.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/88141205361.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/6097547738.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/g0flap09ur1tqe5bji948k6jb5/konatojemifesaporadajok.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/59836005817.pdfIn PDF document text
    • http://flirdining.com/uploads/files/zipuwa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hr4293ips4adnp7jq40g8t1h55/benojisorijafawasevoge.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26aa21a1c0---kireruzugirabimax.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7e4caa2a---33322537720.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210607202804.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/3336891340.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_125014.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3fec5ff2b56176f699a09616c7676daa/39202865407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=types+of+nicePDF 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_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 17604 bytes
SHA-256: d3223cc7a14795cb23a37fd117182968a46f6018a6af9d23c900229fb1c485fb
font_01_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001493d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493D 10144 bytes
SHA-256: 378f6c875c4725a3d4d17a22ff328cef18d571cde5cc027f3629f05811524063