Malicious PDF — malware analysis report

Static analysis result for SHA-256 c194438dec5b00dc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d75d068448f72f73f92ca37ef05d85ff SHA-1: 7a3fa511f2202d68e9d86497aafd67dd13c91dc6 SHA-256: c194438dec5b00dc3860537da56eef9a2b3292a67c2860a4f6e00204f9629d39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=durability+of+concrete+pdf PDF link annotation
    • http://101-games.ru/images/uploads/files/63894304788.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kosebobirirukixo.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/17877985505.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fde1fc7e81ab79c400264b3b272ae944/fusanuvudojokavenezi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/xusowuka.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/7168208460.pdfIn PDF document text
    • https://wagaskar.com/media/kutudosapudaxemimesu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c61ce340b---7859908359.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ad37896ae19f89deaf1ac1cc82be0c4/4643543464.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7a0e3ac02aa6fd735a3bef8e68e4a450/gobab.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16244509207959.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///26911373438.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/vomavexafonirone.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2714e6592---binunogosofaromewetuviv.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f649ddf08a3---76380738583.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a87ad2dc---seludujulapivurek.pdfIn PDF document text
    • http://pjteam.hu/uploads/17043401931.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/gimodisopejamar.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/4865350660.pdfIn PDF document text
    • https://go2germany.ru/files/file/ginudoxezix.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/14f27df891412214b5d3fbe0f717c338/46711427248.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/sukuxepudilisexe.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8feb54660---55775237194.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/fisodotosogirudotixesad.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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 17292 bytes
SHA-256: 1db20f067cb1a68b2576f32b41b637ca260b66655e2b4d87f0b95b749cfa5691
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 10800 bytes
SHA-256: 44477209cee42ab2890b6706929785965a2bb2b39defda219dcab5edb2874221