Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031c758ddd8272e…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 08:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae38a500b8f314336d80b24c517ab93f SHA-1: 1e7341e8d7d8c1bea8a8ecf71c211a8ff37dff57 SHA-256: 7031c758ddd8272e55034e5105a4392c0665e1fd560724542d9c30b487f5d773
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The PDF structure and the presence of multiple links indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://wastran.ru/uplcv?utm_term=venice+why+was+it+built+on+water
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/zusodubediduxugisew.pdf
    • http://wienbildarchiv.com/upload_files/files/64609539755.pdf
    • http://boki.hu/editor_up/tumeruvoropoxone.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/70222301759.pdf
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdf
    • http://4reality.cz/userfiles/files/37086301913.pdf
    • https://ecoverservice.be/gallery/file/5690024177.pdf
    • http://daindnc.com/fckeditor/userfiles/file/wenatamobadajuji.pdf
    • http://omonetach.pl/foto/ilustracje/file/42743839181.pdf
    • http://architettogherardi.eu/userfiles/files/64878586099.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24b839f0---97419880841.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967ed042bb---51716195191.pdf
    • http://razzledazzleevents.in/userfiles/file/jegep.pdf
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/4666832767.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/94663035302.pdf
    • http://tuyothuyluc.vn/webroot/img/files/40575903511.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6167a1afb24bc7d76514dc430406a413/vusogewej.pdf
    • https://inwestorfinanse.pl/userfiles/file/musezawimuvini.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/kolunu.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e948539887---85922080042.pdf
    • https://livermore.com/wysiwygfiles/file/67937515633.pdf
    • http://retailcop.ca/files/witer.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4bf5d9c97cfe447bb3e6742769718eaa/puvutodewixutav.pdf
    • http://taiwan-tsai.com/upload/files/titus.pdf
    • http://vidol.nl/userfiles/file/10203827457.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/98584eed4d9ae73faeb4424ba1017838/widogogumo.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_off0000b421.bin
3ddba7e32540313117ccc50bae3d173cc9375676eaad96188d9df6ed04959b92
pdf-font-stream PDF embedded font (sfnt) at offset 0xB421 14440 bytes
font_01_sfnt_off0000d86a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 16792 bytes
font_02_sfnt_off0000f081.bin
3b32ef07bf3fbeddb5a1a64a3482a862926c57fd99ab87632c81d8824b4fef16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10736 bytes