Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1785b2805aab2a9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 03:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c30a6fa21b7cf91a78753339766c4710 SHA-1: 08935e7035efab45292bb98690bfceebb78364f6 SHA-256: a1785b2805aab2a98e74042d17c247b08460b3bc799465ec6ce83ad53f711a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=oopiri+movie+online PDF link annotation
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/20791801177.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/27305443490.pdfIn PDF document text
    • https://webhosting4.net/media/file/45048152852.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lejideduvi.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sudifukegovobinurozuxe.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/1810404813.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/livovuxolarekikurenuzuse.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/ridunalawokemedadakuku.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lopawabulegapolom.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/xuretipuwaril.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/pegotitiwid.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161462d0d26ed3---63543107897.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/buparajoguwox.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/37640950789.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/44190981719.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/dowodo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f9i5mp7jh1u0pso36qffqi6i3t/5247790931.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fizajavo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/dokaruwulebozokikaja.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/samanun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404756084a6---gawepidarovude.pdfIn PDF document text
    • https://tckontrola.hr/files/noxojumomafavofevax.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 10076 bytes
SHA-256: b0edf0c867f2d0f743bcf291593473786aba5e05f3567a6255b449cfd5e42cc8
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 17272 bytes
SHA-256: 790cb14ec2758b5b9eaca9cf70e697a69cfebf52d186bdff91341a8c12a4fcd0
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1