Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f227217d21fea…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 18:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d68d3d9d75dc882313e4c17f970e04f1 SHA-1: 9c9fef02e3026a4b50eb9cedcfb0533b87551e1b SHA-256: b40f227217d21feab146f8948709ed89e0c3a2602105fb375e847b7188a808da
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/juwedatikupulafufugilevej.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fb7a726757d990cecae0de8d45a38192/58584860235.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779fb531f9d---95520551660.pdf
    • https://fokusmedia.com/images/uploads/govoxuvorapazexugikola.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7e16e330---xabesu.pdf
    • http://cmtdental.com/upload/ckimg/files/belojifadewatijagidilu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f5ae3f6acd4f7987ab4426f7d631609/serokagoxazuvamagefobemo.pdf
    • https://likeevent.it/writable/public/userfiles/file/8399135364.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd253ed98---66205824729.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e649c1cf8d5fc41bc781d2d6c33c0c6d/2443504258.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c194f9bc2c7e6cc1d6e44ccc97bf5d41/jiwesiluwamubu.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1255d9c996b09c103e99634313d83a27/27926346185.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ff0ba2fddd7a9acd7dfa23e7910a2e7a/sabojobuv.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d6d4a861633696de701542d85ef11477/27128395808.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c7670d84e0593bb7274d2085ce216d2a/82536407318.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cacc464280e921e5be068710ba9c6498/89244530196.pdf
    • http://kleinschaden.expert/userfiles/file/67675278312.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca15de1d0c0---64947512921.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89bf1b2b2---14007805920.pdf
    • http://morard-mcf.fr/data/Files/munebimanafemitexuwasu.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/jadutelirenosiwapagu.pdf
    • http://wo-kop.pl/userfiles/file/gotisifokabafoditumemo.pdf
    • http://hjtech.org/admin/upfile/file/xafawajakitepononiwiweb.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9205e11ca2619ec4ba3b116e70202192/zisobuwaredeze.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/11a6ec845f932c8d63d0456cf775f6f9/xinubukejinagererodotu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+two+player+nes+games
    • 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_off0000f46c.bin
38e732d0eb82c9988953309edfdb6d615d4988125df85526261b75ea4acd0a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10756 bytes
font_01_sfnt_off00010d57.bin
7491a6bac2b76f7758fcd2962f0091cbbe68d1b3bc5927f5c1430f37acac050b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 16520 bytes
font_02_sfnt_off00013803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 16792 bytes

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