Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b266732e1c95700…

MALICIOUS

PDF

92.3 KB Created: 2021-07-14 00:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c4fe929a324d68f35a4c3690cbb3ae2 SHA-1: 36e9d94e155bd74e69512181ebebb3ebf80dae8c SHA-256: 7b266732e1c9570060f5a3c36479a67e11334f48b5495c2b87d34d5393bcc2b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5dc9f5ac---35608200634.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/79757280345.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7389efd0f9903b6ac4649fa509e44723/37937445696.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/japujapezatuzeba.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/53b9q10m66th7ath6610hg0bj2/4815828769.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/kepokodekijuwiw.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/71888713395.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/85k81lf2u0nfh2hm695hvse69j/mipelefifulepoki.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/dapezesem.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/zivepodig.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/funabezomu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5b4b627d9522635cbed50c47fa19c022/rijunamudivoketomite.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///xarumigatu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/88468433447.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837f716a7fb---10396559113.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/temikonapoxibivupudokawo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1c2daa2abb64e5454d633d011e21194c/41569636987.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//21240502206.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1c204282---dodifanoxa.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed6b292cc---liwekenafafaboma.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1fphsf4i3cp7mqfpesb4e552af/doseli.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6774af6092357c5d47074499442dbae0/12739465204.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091348bc7f15---xunosemed.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/33001872371.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46662075613.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68752830513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+ingredients+are+in+mixed+spicePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10888 bytes
SHA-256: ca91e4f5f0fc9f3c191a4422c257cb2a27f6df475eff063f91d4a61c236fb4a3
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 18084 bytes
SHA-256: 5fb050c6b2611eb3860fdad3368c45bd0f8774a8f45d2056e65afd85f8eeb207
font_03_sfnt_off00014b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1