Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0bdb914488e154…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 23:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 635778f9c9862c688f3b2efaaac751f7 SHA-1: 8fe933c0c15af8482fa41c3ea5b6c737a85e8996 SHA-256: 1d0bdb914488e154affe90c4a1d7bdd30fabe59c6082edf24dd043c56199739d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations. The URLs extracted suggest a phishing or scamming attempt, leveraging SEO techniques to potentially distribute further malware or lead users to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=chevrolet+avalanche+2004+manual PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a2750c22---besagozom.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f86f1805af0a7a2c353d43a993f1d82e/bolatukudutarir.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c202ee2b---94610175382.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vipalawewuvaxuwiraguva.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1sn9kqjp9hmt6u2nqlh8gcthd3/zefemagomevipo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f88479e9---10318201521.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/tijasar.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/29873042836.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/sekuxasatifam.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/sapuseposuza.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/xatuzebixozuni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb2e2f61e---2811300600.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/gadijo.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/92914859789.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/kafidivotumatuzitabarij.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833736b2c69---4556960332.pdfIn PDF document text
    • http://www.centralperdana.com/file/sotexepudalotov.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de9b3de2854---xovelaxeromewe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132755f806d8---metedabinafinaxipofu.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/80957728764.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/64588034898.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/xijuziko.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/5102444335.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/80772999266.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/son82kp4ln5fe0q206jglt0cuu/58354828550.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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 17872 bytes
SHA-256: 85a53243675f15d7d1ee723b6aacc0aa6cc5c927b2015cde4281728ac9752b6c
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 10752 bytes
SHA-256: 42d304d82f373b4c0da6506bdc4cafed3aa07cc2968c9015e1ff9a9829965218