Malicious PDF — malware analysis report

Static analysis result for SHA-256 062f22ba1dde9f28…

MALICIOUS

PDF

90.8 KB Created: 2021-07-20 04:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b607092d21770c8a4b74d1163f8799e4 SHA-1: 3505601755183b7235948d6d1a277bef6f1ea679 SHA-256: 062f22ba1dde9f289ad6624aa1fe1d3871b2d8996c28f680e501852655db9c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/995cc3c41cb9235bd4858b7662e5d163/17418468274.pdf In PDF document text
    • https://led7.ru/file/wajimewiges.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/gusoz.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/287695fc6585d2a7e626a15e57f50011/44195476631.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/gogidajamopofemetawetobok.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cb93f468---23680954647.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607143cd52a54---ziluna.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e4e79f271---1125446849.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ce21f2872ee26195ee4163bd2f3724d1/jitene.pdfIn PDF document text
    • http://kasargod.net/uploads/file/65187348095.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/71661824419.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/80171738613.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rjob5jlc9qpe11fvkqm4pngot7/63742327143.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/34962949693.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/64b865f05b33b559debbe299ece5ee5a/7828267430.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/35656745218.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/dorusizeviji.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/088a3616064e9a70466233aeca2d5e1e/46596694682.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/abfae0151f741d0a9dff10c3a93bf77e/jugenotefugewujobepunu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/98799027883.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689220a84b---ludekelivi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v80lfdip8tmstris9bv000504m/73265203347.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160803260cd79d---11723834208.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e22e3ee8---fekowazikujuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=first+trimester+tipsPDF 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_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 17036 bytes
SHA-256: 4c62e99d8874cc834f95af04ccb57b255b1754e761923cf0ac8e774601f919d2
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 9960 bytes
SHA-256: 89ffa0c690fabbf310ed95a4473e75811f4be08d361f46a37e9224e90c7be145
font_02_sfnt_off00014634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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