Malicious PDF — malware analysis report

Static analysis result for SHA-256 403d7d2bfa90ada6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 03:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a19b5036fa8deead172845fd3b2494c6 SHA-1: ab85d91b6e103bc3c313aed54795a25a8ea97e0c SHA-256: 403d7d2bfa90ada65661a5b222a8b365fc8cccd9fee6c00163d8529f32005a36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=jeeny+driver+apk PDF link annotation
    • http://gallery4walls.com/upload/editer/file/14372956700.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/63a248969a9eee3671cc3efb6b1ed154/4721622247.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/nodipogozabegimovepezo.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/8559526551.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/zejenavabufiwawulop.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e1b10c5c9f36cf5ea539b6e3dd075221/genibaxosexipetopupizodo.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/votegevazofu.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27842051722.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/24070654468.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/bepodavoduwubimu.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/6986846330.pdfIn PDF document text
    • https://slotpt2.com/contents/files/denogirude.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/sepajagesixajab.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s48qfpgmha53avks4o80797564/82321957999.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/39671125011.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/88313057571.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///xufet.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/kixoganexavakepu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/88706615533.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/54442722191.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/36725329548.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/nepoketol.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_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 10216 bytes
SHA-256: 15587e3229078649683ff04eecac1908926722e93fc4f0077d5e9a9fdd1cd5ad
font_01_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 20844 bytes
SHA-256: fe4cd9c9edecd849d4b3f2373459638a1ee4fa8386903fc07fa863c72149066b
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1