Malicious PDF — malware analysis report

Static analysis result for SHA-256 959534d56f994f1d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-05 12:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efffe17fc0892dae10e961188e1e8b81 SHA-1: 92535cdfcba572d44f52e2effede813123757dd3 SHA-256: 959534d56f994f1d4c01927f05f49ed2a76b1b910e86b0566c5dca87d1a2916b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The structure suggests it functions as a link farm, designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=worksheet_selectionchange%28byval+target+as+range%29+intersect PDF link annotation
    • https://advik.net/userfiles/file/77651841210.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/47377594870.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3bb97b5e---35796600785.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8f03f2accab551bbbef20d482b447c5d/zilej.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mokarorowi.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bke51lflmqld0trdov3j4goa6/zefakejafabalodomib.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/zanoziwival.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9uhccm1b78a1j80bjkh1difmf0/17948971867.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06906c19---96923918795.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/6058309312.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nodafodu.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/27288368704.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160dc143a3d6f7---zaruwinazogidonigurira.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a87229e4---84179548200.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/74047251876.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49087bc938---vafitiduwukave.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/diditowejojawewipono.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_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 20200 bytes
SHA-256: d335504e7ebdb45cf4faa3842b97ce2b85ad04e856355cf2590c0bb1b99dfd62
font_01_sfnt_off00013829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13829 11104 bytes
SHA-256: fd314ebfdf5e7915a170cf8afcbdd76bb2bf9159e3a41f8bd6fdb798a6893abe
font_02_sfnt_off0001523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1