Malicious PDF — malware analysis report

Static analysis result for SHA-256 462a1afda0f504cf…

MALICIOUS

PDF

85.5 KB Created: 2021-10-08 00:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60c55ae7f0b209b8367fd76ec20d7833 SHA-1: 5e9daee3a3ae323402c574e9a6a47940c7c0ae47 SHA-256: 462a1afda0f504cf41947594ed75a9e0ce89c3b15c1bb8ed0c3b209d870c0375
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=hyperextension+of+mcp+joint PDF link annotation
    • http://winterwonderlandzundert.nl/uploadimages/files/17551072713.pdfIn PDF document text
    • http://bienbao.net/uploads/files/niluwatale.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/90047420898.pdfIn PDF document text
    • http://canoeing.by/pics/files/matexerodetu.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/buderog.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fepemilob.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/vekarotogonimotozokalunu.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/zepofikowaripunopipeni.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/34285668468.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/33949221306.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/79937495314.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wupafelibuwu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7f92d195---26568337401.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/83284287276.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/wibijoxapikutaruxo.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/66650161406.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d169b4ca2e---73065316840.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bifetiviwiw.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6afaf03709aabc255cc9dc5bc0492d4a/51298780844.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/86233900548.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/8218919642.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/tofabudurodidesi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/69620464048.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/xolowa.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 18596 bytes
SHA-256: f310e1c9207f9e5316eb81c7c9bb3a1804e557faa02eb788fdafd965b4620dc1
font_01_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 10768 bytes
SHA-256: cecc8744dcbc9b0165fea85498dc5b32badd52b76748f178320067da7a07f07f
font_02_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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