Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c2c2f4be5e9eff…

MALICIOUS

PDF

78.1 KB Created: 2021-08-20 11:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80535aea282009024d6e6dc5fbe303c5 SHA-1: 344e3d3ed7a562bcde64c7aeb4b732537d80740f SHA-256: b6c2c2f4be5e9eff92d0b5dde17f34ff527eee8b8da2b0bfd07238c4f3bb6130
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=introduction+to+organic+chemistry+5th+edition+pdf PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb511729851---momixusiwelevewofufiwofi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/24608751956.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b5636492f138986a7c913f192361710e/92979303870.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/ketabigi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cvhdfvn22prrlh3cqbjinu6bea/lobebalegidupiz.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/69878091029.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/mewojiv.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bilulipo.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/37547303124.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/pokufupobaxe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1fe9f89c---duvesefezemidivuj.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/83682205852.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gorebovurijizukeniwe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d75d9a660f---30125950200.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113c7cf188d6---62639179825.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/navutofixurimi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d03eb6f1832c7052dd8b26ebd4c05200/tusipirej.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0o4t7qqef0ig9fv75hnu2sh1s0/tojijoferekamexup.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/84546786186.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/fufotudinavula.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/22992235431.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092016c43dc9---87901843329.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfbb81ea5---boveduni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16688 bytes
SHA-256: 75c53b0ec20f16db1eacc374a5f33dfb2cd915fbb3a0ddd9dd1210177735631a
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 11320 bytes
SHA-256: 46d43d6566eabeec2065fb9eb8ef66c3f356d33f89a3fb387cf31413276ea204

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