Malicious PDF — malware analysis report

Static analysis result for SHA-256 69653707b9089b33…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 19:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c4b40f7ad67c2886b0616c4acce6a0d SHA-1: 09d7641966d043f7219f9301327e1d60f31ead2b SHA-256: 69653707b9089b339251c3a42fdc61e3f712a2a52a782cdce6545d5ae75398f0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic findings point to a malicious document designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=what+is+the+collective+noun+for+cattle PDF link annotation
    • http://arebiatours.com/uploads/files/59569220673.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/96665611164.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kotegirulegoloja.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6d51af35f5d66c4567d7134c97a64f4a/mubegujiridolu.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fariromatanoji.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1e174d1a5fe6dd571198075220b0887e/besivewoxazi.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/nafakufobabimewutimeroki.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gobidifapomat.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/92953343984.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/mokojotarat.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nupuvibif.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135070f241fe---lekamogudasapakafobeva.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fulufegizatamagosexox.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wosukemofozesifed.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/nijevasu.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/vuwizu.pdfIn PDF document text
    • http://ecole.ru/text/images/file/20890419473.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/mokoxolijetomoloxikusiju.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///75107855231.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0b6431d805af70566dad30f89b2340f/nukupoxijozam.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43461679439.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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10592 bytes
SHA-256: 2e7524f333e94fd513330c54d1ccbcbebb9cd45d086bd944cc490a1af5f372dd
font_02_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 18684 bytes
SHA-256: 939852ec51fd49c200ac8dd6c0538b12f9241f579afcbb85bc3aa3616e5884b7