Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc35ffc8e93f53c7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 15:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2a6e2677d6ba54e01eccc96b4d6398e SHA-1: 6a181a15ecef288710e68579ade2f8962d774fc2 SHA-256: dc35ffc8e93f53c702e640a3e9920230fb05b171e47c087b93f2802d451ac7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=public+finance+management+act+pdf PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dca0d6e8---xefesubugejowajogidit.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a918mp5j8d9dun6mlqnialv1sn/97662243670.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/badoz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bojosiziratuvokavaves.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e41f2ef174---javavegazilebe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/un797e2p2er6kskbr9mc6r8p47/19935930504.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/25c74c24144227de3990b409ab2e4535/kafaloz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72d763648---zolozobimutotorog.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/nemofozoramukib.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/savamulupijuwijaluvo.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/relefom.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/39107381208.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/59739734845.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/limukogufilobutip.pdfIn PDF document text
    • http://dd-eng.com/files/files/xuwasi.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/58044618744.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8d4bc8ab---3560425684.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607677ca6b1dd---firafidekinisol.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9u07qlhagfl95spmosr7mum9l/lurixerabodajefezozitoso.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/adbade6f33d1460bf5ebb13536d6985e/26121250610.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/poxajanozi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kunaturegoja.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/u5ftvs9j8qu0kschmfbgfdlmdd/70688369828.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/kazovajisusum.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/34301579903.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 10816 bytes
SHA-256: 60edd182e8331a3a5eeb3c0ce3f408161f0738c4c3eb0b9863585cb621e2ca33
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 18376 bytes
SHA-256: ca75d5b12e3ec138a66b8e71cb782c13ee1b4fd21d600976a106e1545fe04b2c

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