Malicious PDF — malware analysis report

Static analysis result for SHA-256 0094efbe24fb35ef…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 21:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7df15fea4935d3879f70d6e7448479c8 SHA-1: 34b3ece76ee1d4b2b9e5a05a9796fd1d18760a97 SHA-256: 0094efbe24fb35ef77d92df8eb67731b8ead027a328b77209d149f71ad77ea11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592e8bcc18---68468395312.pdf
    • http://zhengfutz.com/v15/Upload/file/2021642345135711.pdf
    • http://domholidays.com/userfiles/file/1816044269.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0p0qgc5oi5uaa3m6g82i2iv8tl/66244274562.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0ea5af1d8ac39ff47c8eb81b6e143218/35463994251.pdf
    • http://montaze.org/democms/userfiles/file/95974958514.pdf
    • http://www.knickmeier.net/images/pageimg/file/44835876580.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9e1a70df8d662de94ea5f17bc9ab0beb/29652994161.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993743690f1---48534449457.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/fonusepunotalajezi.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/df2602366e73e83b4f3c6158993e4fa7/sekujisagasobifopobiwojus.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/460f1fdb11565f633711e806e1fa293d/37931949914.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/11cebc57369e5c76779e13d7f8c055b0/80891913590.pdf
    • http://shannonlakeestates.org/fck_images/file/netobenisanelat.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0af44e38b0630f88c4b544e2de181b10/gifanelivomamigobig.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/zutijonorutobamofodomem.pdf
    • http://sushigonewildtogo.com/uploads/files/lubufudolilufenobeladigu.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/63f02fd85c257152d38896e10521e147/mewurutuvufukonor.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/076d72d835d9bad1edc02750dbe2abd3/91223854046.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/227f6606239828ff073fc8bcba8412ea/segapuxowupan.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607924b188861---febuderefabitopuwobelerov.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7a14bhlom4ts3mr5q4vtfo1gu6/21575745399.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ve8bu6tk8s11tav1o0nks2j8u1/80330532737.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1f062ca7f---44149590782.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/72326a85b476527808fd070d8ffabce1/ponovesejetedopipexuv.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089591e867d6---77869173405.pdf
    • http://shannonlakeestates.org/fck_images/file/41917959644.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cscs+questions+and+answers+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_off0000ef29.bin
b93b47526f2888334fbdc416858ef6b1e82e5555fcc7f6573ea8a93800662ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17452 bytes
font_01_sfnt_off00011d17.bin
da62e143cee27dc6b61deef7ff7277d7f81496389a658374030257a2ea3df269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 10932 bytes
font_02_sfnt_off00013677.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 16792 bytes

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