Malicious PDF — malware analysis report

Static analysis result for SHA-256 be63c1752af09f99…

MALICIOUS

PDF

96.3 KB Created: 2021-09-02 05:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c87f27d6e85e4b8ce8e7969a8fd4b27 SHA-1: a6eb581bebb7b93b7ad1d67882afa19eaa8aee89 SHA-256: be63c1752af09f99f33d780dbaf00bb19df87072f2893c19237effdeba39ea35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, 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 explicitly extracted, the PDF structure and link farm behavior are common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://chcial.ru/uplcv?utm_term=pile+foundation+is+suitable+for PDF link annotation
    • https://mariellatriolo.it/public/file/28613329643.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/lunixararagoma.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fd5d41c9---3361316198.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/23621872712.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/500756ff0c3f5ea2ecba1b9724a4bc6a/74462648839.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/batisuxorazapanarovemol.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/bawudixuni.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xofixeberekileb.pdfIn PDF document text
    • http://ellev.fr/upload/files/kemuxuvatifuda.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/9sgcaqu4mm3gnde4posbkeb4b6/xekapoku.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f63f282a5c9d64add6bdfaf58746801f/wisiwufajazajuru.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/44733182686.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/soxuwiwusasos.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/54899498790.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/2857362909.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f1c2af032d4101290aed7c977da96032/kuninu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c12ea440a---25502469884.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717f1ddbc6---66320936515.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c197a984---61161777823.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/19314299613.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sidavamugaveze.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/878vm4m5e0jqbmpc8qco837l60/kilasazelojijamur.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2fdb27a5169caefdc67ac59676d6d8ae/lafinaxolezofamov.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_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 10588 bytes
SHA-256: 6271c07c61fb22206c75d3aacbbc879a266c579c3287a3dd393a2d4a15d1ece7
font_01_sfnt_off00012cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 18304 bytes
SHA-256: 0e78fb3e8168a7edb899f3073b856b5b2a5b0d31b8f2440045e0cdceecee202e
font_02_sfnt_off00015b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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