Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a384ea53994d3a…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 20:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e79b9392083572706049722ffb861ea SHA-1: 9599882df8c21eaaf740c7e90fc66f9dd3521a25 SHA-256: b4a384ea53994d3ab67acfdd18b425d2d3e49286e25f049684dc50fe33976649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to other malicious sites. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/9859310320.pdf In PDF document text
    • http://poketomecam.com/uploads/files/vuwabulizibalipivewidekux.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/jararose.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/o7pi442ben1h6tigalhc222f9u/volevitofu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54322a554---gaburejumufik.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/19109570800.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c985fa0b91---redakidedug.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/kuxuzugogotudidab.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/lipetowudunojozibedokaxod.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea9fe9cca---66241926498.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dapevojedopazepom.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7017eb61---7737454707.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/54e8b6ffdbcbb124dc5c14d78be9b3cf/1472110083.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f7582ce---11398272105.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/17895191995.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kq3tl2vao33upa3057mtci9reu/dinobubijiwuresigat.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/78792862734.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o3lib9iqmnnjf69tokbuvt9gj4/zosovogapasedatavukesikup.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/mizuzu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dce42d154---66861218771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=malayalam+christian+devotional+songs+mp3+free+download+by+kesterPDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 11728 bytes
SHA-256: 1c303efdccd26f44125b32046c82ad865d2f916c66925a14a8dfc579114d8f39
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 21964 bytes
SHA-256: 96bcc80723f01c02a5da9b09e6a6044a64f5693be66d168ba3433f2d4fd49aff
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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