Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc5ee5e45b8088…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 13:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 742ba1b61747c9be97d1192876da5c86 SHA-1: 791576aedf0a404a21bcc7d4e0affa2f9f14961a SHA-256: 81fc5ee5e45b8088ddfafbe2b01ee7cc52481a548f34cfb546021b2d43ca6027
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=brawl+stars+apk+yukle
    • https://sogelec-eng.com/files/ckfinder/files/46216643639.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bbe68di9ufoe29gkm3kmasqba3/83018300272.pdf
    • http://daonshop.com/files/fckeditor/file/31878508293.pdf
    • https://shinaltd.ru/images/file/26285057471.pdf
    • https://birsamundapark.in/userfiles/files/xedirepeme.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021dcb80db---topugeguvepusexax.pdf
    • http://fittbikese.hu/files/file/jilepiluxazonerore.pdf
    • http://gpszone.hu/upload/userfiles/file/foxexato.pdf
    • http://vaynhanh365.net/contents/files/56623449817.pdf
    • http://natpuedu.in/userfiles/file/pipisalajorugakifol.pdf
    • https://efficimm.fr/userfiles/files/levawolumawopilale.pdf
    • http://webmba.fr/client/logo/file/32683840762.pdf
    • http://djpress.pl/Image/files/27467665819.pdf
    • https://kibledergisi.net/resimler/files/regetujamep.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7f855df03657cbbfd80b191bd0df82d4/lamewu.pdf
    • http://najlepsietorty.sk/uploads/fck/file/55558198346.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/fudedasu.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161443ee6470c8---85648557458.pdf
    • https://coffotea.com/uploads/files/202109101024285405.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10425909653.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/fazunimiwikaze.pdf
    • http://wxmx.cn/upload/ckimg/files/202109141401541929.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/80748938348.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_off0000cb69.bin
7d03c5ac442db587a359542a1524abf3011cb855e3b123d95da62cbb39904e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 20316 bytes
font_01_sfnt_off00010100.bin
692b156d1b592fd884bcb94e072145103ac474149bced1514112eda5359ce34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 10376 bytes
font_02_sfnt_off000118c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes

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