Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8022fa657c3c5b1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 01:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d01e498637c7e4283b8ab5bd582214eb SHA-1: 17324b82ec19ad8828b41eec7d5e5dc04c44ddf4 SHA-256: a8022fa657c3c5b145b46733ab8d9d968b7233b525933badb409614433bc8ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://khyatiinfotech.biz/ckfinder/userfiles/files/motenedix.pdf In PDF document text
    • http://dellalontra.it/userfiles/files/93878173924.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/adf3cc426ad6998c4ac0cb34b52ea614/33977095958.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/tubupudig.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wamatapawuxazefubu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a014ce270---delosikisugijisukub.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09fa244ca---57185629858.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wakabalibowilolu.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/41864626626.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/10149028666.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/87388036991.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/32526829716.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba5ea89ce---dolexe.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/79171049033.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/zowidegupazojuduronafeki.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/69754327515.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210901_592BC117B64B7A1F.pdfIn PDF document text
    • http://okvin.org/userfiles/file/95246621069.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_667EEDAE4350418A.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/nawuxatisuvomogaxewi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/39528069714.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/27061128105.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/pemimopamemupepenetab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pure+browser+video+downloaderPDF 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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 17388 bytes
SHA-256: 2a6fb8563bc3277daea881702cc69c6da9a37f347c61896c012db4b5896a9f00
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 10536 bytes
SHA-256: 1f36b6f926345be6d7a7f301abb5330ac87465351fa9e19a997a0d4745330193

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