Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1a591be91a0abb…

MALICIOUS

PDF

130.1 KB Created: 2021-09-05 06:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0c6bb0fbfbad6bad2886a588609544c SHA-1: c34423d6f94eb340008795953ac889c55811551d SHA-256: 2d1a591be91a0abb04af1d7dbf9b989b52c31a2839d62f24794f1c9b20b3de1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a campaign to distribute phishing or malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=pmbok+stakeholder+management+pdf PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e7b797c829bed4b613753e53a82dced0/jatow.pdfIn PDF document text
    • http://freetds.net/userfiles/file/57952475682.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8cf129494---xikiligim.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/gadopurirojix.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/8921455167.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/79029923930.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc61434b9---wisaluve.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/47137417666.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/95971534815.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fimosonupepetanajoga.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/64294095039.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3da77d29---52359878388.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/xafewatunelimasobam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7528b9b873---semedupigezorevo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/57834015179.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/3474259528.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ced747des92q9iig82ji10vem6/66689161701.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d83dc9e0---mapogu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba19c8d2b---12781285102.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/7397166942.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/4829791138.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_off000195de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195DE 19900 bytes
SHA-256: 34902bdf5f47afdcdfee11a9bd98bf8ce7e7e0642160c1e4a2d1288c5e0c5d2a
font_01_sfnt_off0001c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C928 11084 bytes
SHA-256: 8222a4213ce71f593a8397f2c84bf8c88f8a89c1754f8c1b4f2d3e7ea4f65d51
font_02_sfnt_off0001e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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