Malicious PDF — malware analysis report

Static analysis result for SHA-256 85096c24dc156524…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 14:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63c0ea10435cf7dcccad9f8232cacfcf SHA-1: 33c44b1be098a34427fc6c63f28e4f392bb12569 SHA-256: 85096c24dc156524bf99fde65da71f00042d827a8e052ccc00993e865ec36eb5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs, many with 'utm_term' parameters suggesting tracking, points towards a phishing or malware distribution campaign.

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 https://medvor.ru/uplcv?utm_term=c%2B%2B+stl+book+pdf PDF link annotation
    • http://zzfcw.com/file/fkimg/file/sojaremodebakusefe.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/40465994311.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/11800896024.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/85982853342.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/45662294889.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/68265248523.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19a505c3d---figefekibe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1f8c2e2c7c95f656b6035568f0774f73/22544274417.pdfIn PDF document text
    • http://guchen.ru/d/files/85334298288.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/jaseko.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xemakaderareg.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d526a2d4---92196700427.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/kiwolijedogebeb.pdfIn PDF document text
    • http://blccy.com/userfiles/files/sulagag.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/ponabividawapeginipe.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/98518081471.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/74030222487.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613731bcad381---noviwu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130240d20188---laferapezukanipa.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/biledoxikutemugidav.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30945360248.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/12749835439.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/60084518837.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/xiguvukuwamuvotexiw.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/73224438226.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10164 bytes
SHA-256: 90ed6e58330f6e5e99415b8014c359ac2ee8384bbedfc61501ab0141825c5e2c
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 16860 bytes
SHA-256: 6c79887f7542c2a733ca6f2785585c261442ab1462d2f3428b3412df4790e6dc

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