Malicious PDF — malware analysis report

Static analysis result for SHA-256 3502ec5ca9b7a4cc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 11:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63cee907ce25e7b39e054c71a543edae SHA-1: 10be3ce3f524d952321970e7ae2bf53f361ac9ae SHA-256: 3502ec5ca9b7a4cc74c903736025d32ab0849d5e53eab593838b4e0c6f0ba97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The presence of 'utm_term' parameters suggests tracking or redirection for malicious campaigns. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=apk+dino+hunter+mod
    • https://xcheck.vn/uploads/userfiles/file/jarokokogopabagufub.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/gimuxowegonuruxojusizogi.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161465f7086e12---77752252797.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62871918942.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/80199607433.pdf
    • http://studiotecnicodavico.eu/userfiles/files/zinoxajabi.pdf
    • https://chsins.tw/uploads/files/202109130316171500.pdf
    • http://pyhunlian.com/uploadfile/file/32080115380.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vnknl6phvhslie1qnok1ielo65/99805707459.pdf
    • http://intertravel.hu/_user/file/jowogi.pdf
    • http://topenglish.sk/app/webroot/gallery/files/pawimomow.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145442f8aa57---fuzeledejipenu.pdf
    • https://tttinox.com/upload/userfiles/files/diriwomofebotagosusuro.pdf
    • https://bwawarszawa.pl/upload/file/dipumazaj.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcec3f4c4---73421396587.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/simixefilizanogudexerom.pdf
    • http://teamtrinity.net/trinitya/file/newerowasir.pdf
    • http://machulski.com/public/file/fofetugotuget.pdf
    • http://khojedu.net/userfiles/file/pipuvurawa.pdf
    • https://efnnma.org/files/file/2263298694.pdf
    • http://dagmare.de/userfiles/file/suwiwoluba.pdf
    • http://hwayinn.com/image/files/20210911_115036.pdf
    • https://museuminiaturesbesalu.com/files/fawapepavetigovefapubane.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb62.bin
11644ad3b6536e9725fd56a81a3ef46a1f4b2a2a9b2c0e9f783fc679204a3b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 10452 bytes
font_01_sfnt_off0000d2e4.bin
fbc46957b27bfe805013f00f3df73fc04bd92ac1894882db8fcac04c223e8e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 15808 bytes
font_02_sfnt_off0000fb23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16792 bytes

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