Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86bd71bec007eb7…

MALICIOUS

PDF

86.2 KB Created: 2021-07-06 23:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5756d8f5234e540c93fc31e2b1632897 SHA-1: b60b5480e6754a7ed75051df5ce4585d4b624538 SHA-256: d86bd71bec007eb7ae62c6a3857d59cb128b3bedb8838292ec69e6c6a0cdc7be
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded links are the primary indicators of malicious intent, likely serving as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babcbeb4ca---batusit.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e5eb7ef7---kosid.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/791b912c37fcfc744a123864ea235941/suxilinekurerajanagexi.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bd68a8867---moluvurokarunedukato.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3ba2f4f05ebba87d9b1e037561d4285c/66701721008.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c2bc616b0151c45b9c915c1054116d9/xatizukoralomuxoketej.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69bcbec64---29198497960.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/35468d46fb9b7b21981b2abc7e3c5d30/febatuwesimusopafoti.pdf
    • http://robbes.nl/media/files/taven.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e3d71fe7f1d71c53f1e08bf6249ea2d5/redekanal.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1098a8c40d1e4c270e89e3836379a208/razuxodefosudi.pdf
    • http://caigeshi.com/uploadfile/file/2021061720294073499.pdf
    • http://anbao.vn/uploads/userfiles/file/79158287110.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/67922560253.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/caf51bbcd77352ec9398214e806dfcb4/58076340788.pdf
    • http://alemotta.com/resources/original/file/tubovuduxigimezun.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/95mnftego5at9ldpg9tj7igtac/59618220766.pdf
    • http://onnetsolution.in/userfiles/file/fuxilujapuxeduwugetukogu.pdf
    • http://alnadaoil.com/userfiles/file/nisusoxalibixazetikipediv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+catch+a+cat+on+minecraft
    • https://lapdonline.org/file/34942400250.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_off0000ef68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
font_01_sfnt_off0001077f.bin
ccf8e2352374b1fc441d4b4ba1c05acaca6c5dabc4e25100a6ecd3fbfdacca9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10464 bytes
font_02_sfnt_off00011f05.bin
bc12e9ab74c9cc0e66b30a162c32674ec58dea282a636da7df42e7cde8f9944d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 17168 bytes