Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2563622013e6541…

MALICIOUS

PDF

99.5 KB Created: 2021-09-01 12:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb46592b0a2c75a83207e434e8704dc5 SHA-1: 462a34e75a9225f4435a3358c60b811007fd9a7e SHA-256: b2563622013e65411d011aa3350994d55c08d5edf438a0046f2ff1ca46d81c96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ankaratemizlikcim.com/depo/sayfaresim/file/pudanotataliza.pdf In PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/2365191871.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/72994687766.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/33524121202.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/genuxovazaneladi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zujogazusadeve.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/72622323236.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d1nep45sjalkhoj10ouo0oc7c0/84934036735.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/mtd5hcudff79p2hr4p0b071jo1/telopebuwuwozolumaxozevut.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a51b584fef905c70df6228022241afcf/berafifupitajugudolos.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868fba1cf59---77022499668.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1e2483df28---98461419688.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/sibuwudisufilalur.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094df34ed35f---wusekiwepilel.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b77842c4b4eb0a4f4d8d215d5f54ec96/94348233525.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/rusabozosomuvo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55940091269.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/lujumubipulagabelenewune.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/m2qgfpke9mn19snv190qseo061/sunobolatebiveselanidexol.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/24310493162.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7315f3fd---mokabej.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a1673a361fc7f6ba8a9bf08f91e9c0a/99697758819.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c48396c0c51392363e393e363c3f14fe/36983897576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=grandstand+meaning+in+englishPDF 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_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 10612 bytes
SHA-256: 32f0dd53cf4d68c1dfb709ab2384b9fa71fa2272aa146aa370462c4c3cbd311c
font_02_sfnt_off00014d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4A 18980 bytes
SHA-256: 2209f8cec30f20eb5e381ff84cf30344f9e4536ac450636e766d546af3ee2286

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