Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b91b7747a78a00…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 02:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a280bc4cba3f19736dc891321518015a SHA-1: 4ab1fd6cba4ab826a9b3e44d21f331cd4ac57fe9 SHA-256: b0b91b7747a78a007b3837542a507ea2b020f2f66a896ece238dae7c2909147f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, including those using WordPress plugins for file uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/20a91394f5315446224bb01b5f1721da/51878038129.pdf
    • http://timavoshipsupply.it/userfiles/file/vajilatekufuvobegoj.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/iqa2h47akfmup9kfq9rfeetcnu/75637760508.pdf
    • http://righetti1970.com/clients/872956/File/963626949.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4a75439f0ecf9b3576b274112191b21c/siripexinadubijulofim.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf97600c5---vobetopukugiperew.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d48329157---sonotuvewof.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/93e292f3b54517d78fa768026761b797/dimagiwanamuvu.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f24ea650b3ac7475d3a15eacc5d0d53b/18198328249.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092447f9e2d7---kogibewugavafigeziba.pdf
    • http://wsp.pl/userfiles/file/wejiw.pdf
    • https://alshamiltrading.com/alshamilfiles/file/68033465669.pdf
    • https://eslms.com/userfiles/file/muzasuzuwugibilisow.pdf
    • http://driver-jazda.pl/upload/file/rabelap.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160875d15efe72---25345701251.pdf
    • http://lamachine.nl/userfiles/file/mowaxomigedodipikumusad.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/733b35e6352ab1c58a88ebf64bad4f0f/gekamosejewafovazus.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c47235d8bea---23642399067.pdf
    • https://udruga-invalida.hr/files/7276162955.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3c4730b---32155966240.pdf
    • https://dolcezzecaffe.it/file/60723006436.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=list+three+barriers+to+communication
    • 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_off0000ee99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16792 bytes
font_01_sfnt_off000106ab.bin
4a705b83ddbed437f2a05f620f79ba9f963d0d2f2451d216147fc4e1d2004545
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 17064 bytes
font_02_sfnt_off000132d6.bin
9b0b5a5d09a02be904619c1e16fe695633263519ca7539ef719662fa1a211c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 10648 bytes