Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b59ba8df5af6c26…

MALICIOUS

PDF

74.8 KB Created: 2021-06-06 08:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4262d51edf121d6254750c5fa65004c6 SHA-1: f94a2d654a94150ae5a812d42782babfe5aa92ed SHA-256: 8b59ba8df5af6c2647aa9653f6325073485326aaecde85853a0ab9d86d27580b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=ganpati+songs+marathi+non+stop+mp3+free+download+pagalworld PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875303abaf---89705546903.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8352a2851---budetawogo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bepobulipovonosoti.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3215dd3d9---wasekufenabiwufedibowir.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/fojenu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160868207b690d---pevufetabinosolokol.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e2c76b95dd93883cfe5fd17afbf77a92/bexevut.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ishkbnc3qfoi0anomsutdu7lj0/88826842913.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/38477526470.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/venigejasuzulilibejuvur.pdfIn PDF document text
    • https://luminex.pl/upload/file/dumazezugivasoxipajive.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b4c0a50ec4a14450de1139f68c1d4ec1/zowesujubu.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/lijegisabudititidakojuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 5744 bytes
SHA-256: 5379cc5aca2627e7b025f29a1e452daae4dc715c6e1447303e2a089f1c6a45e4
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 10768 bytes
SHA-256: 2ab4a95b10026d97e0d3d88d1eb5910806e9d5d5715a4887ff4f22a698aa5a72
font_02_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 3496 bytes
SHA-256: a6b27f559dcab6ec71826ea54529b6fef478afcc8f120ebef38f4276f7913930