Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1a482d234f6647…

MALICIOUS

PDF

103.2 KB Created: 2021-09-03 14:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89b4d2c0adfcc6b92f5664cea5e221ef SHA-1: 724541472bc76e3643f6dc37e9bc1801392bece1 SHA-256: 6e1a482d234f6647778f372675a34f2d0cc673a1c2b6988da011f83c55b9d21e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kwartetproforma.com/userfiles/file/wijawok.pdf In PDF document text
    • http://msslink.ru/userfiles/files/kibukefuluvurore.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/5007551294.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06bed9f33e---70957900705.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/75677862906.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7d88ec33---mamefirepilizosatasam.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v25b4ldvofm7i9g733dqlvdu59/weguniminumoko.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de045de47288c6abe0949f6a0df00eed/wuzubuvepibabenoveletis.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/55371394264.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f317a774b1f---papefozazunapej.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/71272891286.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410fd23ead---tedipumaxulobiwesajifig.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a589198eaf6---61417434842.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/zileguwotezozuzelotufute.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160838875021f1---mebokopabevawasakunaz.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/4334085201.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d20a34d31---50874189470.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/71109857225.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jidujiwudebe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/49b891689d63799dd8ebd91ffbe950b4/xelijisazetagalo.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/5743241654.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zelezetulerolexerejufatan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=peranan+ulama+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_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 18112 bytes
SHA-256: 57b63f5dc8c8b6afd1ba44b903d87893b8d673a490862df28b4c28677747f29d
font_01_sfnt_off0001604a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17861 10280 bytes
SHA-256: 95a697076573a715d1c970d1e8f37c83c55d7d66582eeedbc7c838d959a3e694

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