Malicious PDF — malware analysis report

Static analysis result for SHA-256 6591b2217c564a54…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 03:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1cf1a769ac4319e50393a6ac7a32ca9 SHA-1: 9c05e5d17d7b764f5d1f184b7d8da824bf7c8993 SHA-256: 6591b2217c564a54feacf3dfe21753ba44bd92bbe7854d861934ba495cd28640
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially harmful content. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://anabakorea.jp/userfiles/file/97300222323.pdf In PDF document text
    • http://unixsensor.com/uploads/files/202109120201338771.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/vizovukotikekizogujowugu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161440db403bd6---tagude.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/xasileganumejepumi.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/10718396168.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/61244277292.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff45200e5---84066611062.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/72270697610.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lisadigojogur.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/52555773116.pdfIn PDF document text
    • http://poorclarescork.ie/images/bovelirenuruzojevepusi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gazulamenipajomavo.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/winoki.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/gopedezubimap.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/437fecd16a79b6198b10c81c28e4ba5b/46865534959.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109120853008004.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/89d87b3631bcb2d7d7464117247e3060/runawokedakigeb.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/lukulivo.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109100624068343.pdfIn PDF document text
    • http://spakimthi.com/upload/files/45380958419.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/eee2159332239951810b7df2149acd07/72080730264.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402ce27675f---jivapogafitobotoxitexaxi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vegupub.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9cd86230ae3049b39edc626157ff8fe4/76300977912.pdfIn PDF document text
    • http://zenkatsu.dk/files/58965807853.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/modiritupemofusufixusol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=debby+ryan+feet+picsPDF link annotation
    • 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_off0000c3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 10560 bytes
SHA-256: 05ce84f220972f7ba26fb4064bedcbdcc9b4ef1778207ca1fd35841ba1acb66b
font_02_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 17992 bytes
SHA-256: 39d3dbefd2a8bedc6f5086053071beb38f86c7e1f094e4719788650e47f74103