Malicious PDF — malware analysis report

Static analysis result for SHA-256 471dfc69fefd13e0…

MALICIOUS

PDF

89.4 KB Created: 2021-09-17 07:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ff8c1edad4e356b53a772538eff695c SHA-1: c5a9116894477792dd3fd37a86cc260d93dd87bb SHA-256: 471dfc69fefd13e0268d5a736eea313258c629654cb1645e2bd141b11703cd2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=vipbox+vipbox+tv+live+sports+live+streams PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dae270c8---feranazuvonomase.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/kotesanunegolu.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/jejujegorinuwalalom.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/3539832605.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81502390617.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/govabuj.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vukuluxe.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210903_0C98A1AA1EC66AB3.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/52889957921.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/31164582187.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/25764347107.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/todotejeguj.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/50465580837.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/vuliro.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/71972971065.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210909074225.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/jizeluvozejosi.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gafujesunefadameve.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c695244b2---japulakeludubew.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/kewokid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13612560485.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/71526496965.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125ac35fd0---gugagita.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865b11b30c---28040671296.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16948 bytes
SHA-256: eeda0bd1bb71bfa52c61b3a195351c7c81c84169e8ef2687c1fdfb83133749ab
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10588 bytes
SHA-256: a64d4ee4464a0ec9a2a6bcec1e04fa305c16982102613887e7a4a61856ec5b9a
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 17484 bytes
SHA-256: fda4db45364f72849c3f4eccf69b1055587f7eb36981119cb776220550610def
font_03_sfnt_off00013f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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