Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f551e9cf5cc545…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1367be4c28792375976b92408767805 SHA-1: a9a36476f7ba3475e705fc84492945570d583450 SHA-256: 88f551e9cf5cc545e3cc9d75d178c46d0a2e2228ee1654742565c1e264a2900d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external PDFs hosted on various domains, many of which appear to be compromised or disposable. This suggests a link farm or SEO manipulation tactic, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://adlinefor.com/home/webagen/public_html/korn/data/file/kimimorigegipida.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33912462028.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/lopevuv.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lemiwetizujukesupewaw.pdfIn PDF document text
    • https://85097781.com/upload/files/44784178596.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63d6c0b2ea73e8401ce2bc2e575324a9/63247271309.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tukixisawure.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/raxanugasukinevi.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/buvununeti.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/1874224508.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608504c190920---sudavorawukovawiwenize.pdfIn PDF document text
    • http://shophouse.info/images/files/vuluwefojizano.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca058196640---vadeburojodadewono.pdfIn PDF document text
    • http://signauction.net/userfiles/file/29649895241.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/51944859337.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/7144063980.pdfIn PDF document text
    • http://effektfilm.de/files/file/84558313072.pdfIn PDF document text
    • http://canvangdientu.com/images/file/bamibukifepifupa.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bd978e2cc2b96a15074927b40854e57/bivakuzuxetulizojajot.pdfIn PDF document text
    • http://jfe.hk/userfiles/degusuvefosetimamovar.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/pigufot.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/paxoregunow.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/70047615091.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifigijuropevewu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vubizufoxisupuxopuso.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/balilad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jodorowsky+way+of+tarot+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_off0000bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 17048 bytes
SHA-256: 6b7cd06da767e75e08e92626b920c28fcbd7e329ac32e75216115765045bf9e1
font_01_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10400 bytes
SHA-256: 9992566a1de8fdfcf6ed621fde13177a93eb24fc244d9d5f6f5e7e72c6c7349c

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