Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fea2379a9490573…

MALICIOUS

PDF

69.6 KB Created: 2021-09-06 13:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4602c8760f588881b3c3f6ff395a6b6d SHA-1: 1d49da302ac428c402eb7909d65918219f17fd4d SHA-256: 4fea2379a9490573c9ed2a942d243d4bb69212e4cb09d75d9905122406323584
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nesemlak.com/test/images/uploads/files/dozud.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/netibat.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b0nolpsa4mspdb78qr3sf6vuf8/73758444725.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/31321736131.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/dupiwometifarixawutezuta.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/80ed26a717bd63b74ef6b43acdfa44ab/kemoramopotedofomamaxe.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/nebewedisaguvel.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/11434289458.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eecb8027---tevifupaga.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/p99h64q043si79jr0qv57um0j1/kuxugen.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/vijakalebogejevikowutege.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beffb7cf037---5120556370.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2d00f1b---totorolajujef.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/ginojudizibexikutukuvaz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a4ba7955d08006b89c0fe5a3968f75cb/92541811701.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gpe9j6bqfeg86o9ohbm3bg9ghi/juxixepezepenisujafoko.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/simobitok.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/76005616283.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/givukusavi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/37950883.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105120208.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/76166566745.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/sifiponumodawofoxonujepil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=music+theory+circle+of+fifths+pdfPDF 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_off0000b4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 14536 bytes
SHA-256: 8b37dc1b7a4a9639438add10f059a3760d06a60db559084c15f1aa114229a161
font_01_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10656 bytes
SHA-256: 5effdd22872544897fd661ec6bcdebdd6e7a3c4951c3419b2f1d94040d480d6c
font_02_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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