Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f431ba4cfc85f67…

MALICIOUS

PDF

140.9 KB Created: 2021-07-13 15:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 337aa31e6a6295d65398dcdb2b1b0de7 SHA-1: 048fcddd65f6d386c75987113791b0735de9ba15 SHA-256: 8f431ba4cfc85f67ccfd057f3b058acc400906361f4abd103afae3abe1509e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://oniceh.ru/uplcv?utm_term=from+the+physics+classroom%27s+physics+interactive+worksheet+answers PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/982b9b93f718735e1d0e6cd85518ab39/rawoxobozoxolipuwa.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216222233303927.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70726c996b---71147811206.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rse5rcqukgma5kotbrj0h608u3/paxizizuvanejedokorabul.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xazifosujedumizomedenat.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/19m2ch65g422hrdcju8t7l3tsf/1638977408.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7617a823e5ef332a8f1bfa66a816dbad/tolivixido.pdfIn PDF document text
    • http://boratohumculuk.com/ckfinder/userfiles/files/tepigorilobadevipenigi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/22310611218.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tlekc76angbgp56vp53cngjhl5/62003877792.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/xefobevakubinewubo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a90d9a5c---sazozuvugumikerodawifis.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jorirakofabaniritoba.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd426b5267---bofupugalaxaratedenoki.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/rexotuxalexiloroni.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af79f66bb3---sivigutigajokewewivaloxiw.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/552f2d0b4c6972b0699fa22471234901/88773201556.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/razavevakisenujoxudut.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e29a3868d---liditonoxatas.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a34631c63e3---70292766022.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/redujamisak.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/popixovuzusasas.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zitigosu.pdfIn PDF document text
    • 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_off0001c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3FB 11008 bytes
SHA-256: 75b0dc4ec3f232e72433f5d1597c657c20bd8e1ed079fe8fb4f89f2d44432083
font_01_sfnt_off0001dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F59A 17916 bytes
SHA-256: 480d074ddc13204f123db68a60b1f666441c25617c18b7f92fa09b7d2b7ada6b

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