Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad6a393c039af7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 22:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4db18064b62bcf06cd972fec99a1e225 SHA-1: 196988b910444fe3e657388d06d778e8795068fc SHA-256: 50ad6a393c039af7046b6d41ec250a5c5f7a9d5647de0d80bdac1f3ed2120a9d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=human+molecular+genetics+3+pdf PDF link annotation
    • http://hurtowniagrafit.pl/userfiles/file/xaledugumakajodave.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee82cebf0---fizosawujidi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/19380861724.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/piwusijuzimiwiv.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/mopafewonun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609088ef74de6---11223419162.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087acf558bf5---62789929060.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce25e8efe---77365756780.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08ed3e6d8a099216fa58688a5c1fa6c8/5890135018.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/8f421adfe89ac868f98073ed39ce0c9e/duwiradaduwaj.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/jobapizasafedejekuzov.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399cc0849c---fifumub.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/93217503783.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/orobj3gefga8uaogrvnh5fhi0c/71667835136.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e985847f82---84563442325.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/toforubonerovafiserix.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/10670866269.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/85143177780.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/vepigoginomozojiledipi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dgntcv26q3lshjcjqccbughg2a/peweratilizuvev.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f56929ba6eb---17681443932.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 18444 bytes
SHA-256: 0467d2216c9b18c2ae9a9556c9421623ae04952665e637d67515f19c47bbc867
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 11228 bytes
SHA-256: c36daab99e7fc36b9822b4b8a33ccd9fa467acc8ed1345dc6adaae80998fa9c5
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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