Malicious PDF — malware analysis report

Static analysis result for SHA-256 d825a95abdba0763…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 17:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44fafbac016f99b36ebbb9d50c7e9c9a SHA-1: dd8cc93d84315d73275d657a528161664e4aff00 SHA-256: d825a95abdba076302d65b9643ed0ad4b9ffe2ea0029f9c87892d0a916eca1c5
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to compromised WordPress sites, acting as link farms. These farms likely serve as a distribution mechanism for phishing or malware, as indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and the ML classifier's high confidence score. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd13a3dca9---vewoxibabekum.pdf In PDF document text
    • http://ketoanaca.com/uploads/image/files/jewoxozegufutipomilurorol.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97350528843.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/69007219676.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/45098120924.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/surisazigalaxowerijoweje.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613390ac53e77---repiluzoje.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vunoz.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/jasefivezijul.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/34015690963.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/metofobagotitov.pdfIn PDF document text
    • https://cargotavio.ru/files/file/lowuj.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71191422271.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/madikazilovo.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/30773633592.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/63915968176.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ut0f1aj7fhkvvdh48pc7msibk1/peramujamafulusovu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/bowakepakisonazu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132b80ded1bc---vepibebuzilaxexagowitudu.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/dakideriwadud.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14750b285---49030676514.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/36193851691.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/52305544003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=toyota+owners+manual+leather+casePDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10664 bytes
SHA-256: 2266f9c0afc07170dfd8b7c4ad80d15854c91fc3638fbe59e2507190b8ac59ff
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 17884 bytes
SHA-256: 6e32f669d17677731fa6d8898a5db132d9c1df389192cc72d3aa978d5b63d6b2
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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