Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f1754fca34813b…

MALICIOUS

PDF

92.9 KB Created: 2021-07-01 21:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb80a90b254c3ccb9d5ef9f47b10a4c0 SHA-1: 270cede955a50e4ba140f9fee613cf8d98338f77 SHA-256: b0f1754fca34813b44907f5ef717b2f918924e222280fb2a4c33a6719774d522
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://grancom.by/upload/docs/29755836064.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608227caebb46---pifuzosusawani.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hh27q7fjd4cphfn1tu11qajuv/xuxumezowuzefuvarolaxitu.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/43145957915.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c4ae3e42---tabusibomivubowulenapu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/butizigedegoza.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/n3ctq4974tqlk808aba04dp737/3978054187.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/92734905430.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/aae8535e77a1565b48481615712d6700/87463062453.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vixep.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/kozes.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4b9582c87fa3db2b33c29a88c50ab274/buwowaxegezogujiv.pdfIn PDF document text
    • https://dptech.vn/uploads/files/fewidojog.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/79628a8295cf610d49908259c38e5842/44005355475.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/68bcc7fgu2echsuoge0m7aj2a3/fakozusimuwemokape.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d4f338ca7---91457437994.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/5215503732.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf830439ea---mamolizaxovogilutenaduf.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/fakumovi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vj6bvqicusbq3abbpulg1ucsv7/48064102192.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/324f74776d21e8f17beebecb051c04ba/fuporiwaluxepumaloxazade.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ac65894df401f4fb1e349c7d57478646/26237547651.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bffc3f71ac77eb30a6f570ff1bed3181/wolodija.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f75cb758eb5cedc81428e810c59769ff/76799504035.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/59960255729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lateral+area+of+a+regular+pyramidPDF 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_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10740 bytes
SHA-256: 849da00cc51903c8583ecc7691c42fa29794b54a02a00b72e4aecb4362547851
font_01_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 18648 bytes
SHA-256: 09cf8a498cb5bf43d33da0223f9ad6dcee65a98a12d92ac7ba30ed7f169df49e
font_02_sfnt_off00014cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1