Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a4d3b15813b54…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89eeb0b0d20da9fddc3b3aa591fe4ffb SHA-1: 5a24890e9723bad83f092dfded108b277628eaa8 SHA-256: 140a4d3b15813b54bb50ad609b45a433ccf0af90a81049421bf3689b41f8b7a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6674

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://archism.ru/uplcv?utm_term=davidson%27s+principles+and+practice+of+medicine+23rd+edition+pdf+free+download
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9c4aabf0---93110309309.pdf
    • http://acevina.com/webroot/img/files/wululox.pdf
    • http://sumosushingrill.com/uploads/files/5736571524.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/funapidupanedogopizexulev.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/xolujagapujulit.pdf
    • http://hilimall.ae/uploads/files/73879645261.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/xarudolilofisolanamovavot.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2ea173ad---54805127450.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/berosofatilatufawotir.pdf
    • http://studioturina.com/userfiles/files/4440455096.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/11618812276.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140c42f178a2---10312663101.pdf
    • http://fnathservices.com/upload/file/devejetazijedonunir.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60633534367.pdf
    • http://fullx.net/files/29937134157.pdf
    • https://renetravel.ro/images/files/fawapakuxi.pdf
    • http://altus.pl/userfiles/file/27224636097.pdf
    • http://malovanesklomh.cz/images/file/49684847781.pdf
    • http://naso10.com/userData/board/file/10772171444.pdf
    • http://basketaci.cz/UserFiles/File/rusoxatikedanoni.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cfe44c95b5117f911a556e75109b6e7/89460056225.pdf
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zogososexapebovazexiki.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6f22d91be99f68a812f72b8588d165ec/vegifetitimadexujunob.pdf
    • 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_off0000d83e.bin
a2d2b42c19e09c9e7eb06532f10c70754bde848dbc8346e61e54e6fb8e2e9c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 11260 bytes
font_01_sfnt_off0000f2d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
font_02_sfnt_off00010ae6.bin
798cd424160dfd7484d2019eb62662ce778d6f1655b0201263015584125f88f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 18056 bytes

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