Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f7de08a00bc5e…

MALICIOUS

PDF

92.2 KB Created: 2021-07-31 11:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c4c9e38a2389cb3b8ab71a6e48b74e9 SHA-1: 59b5db7a6666beac2921eeb8b5c31cc1647a02dd SHA-256: e20f7de08a00bc5eb263abefc2220df589d8e4361810dfd8a0ec454f8918b57d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicative of a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catwalkdogcome.com/editor_upload_image/file/bolunikigilevasufizo.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/t1t5hdop3d1hdnk0cfkuu53djv/feviparomumiwonibi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc343db0bb6---60768601900.pdfIn PDF document text
    • https://mavibusiness.it/file/jevofibibiz.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/29801834665.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/27867133071.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/90827289103.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/07cb89a64d6734ecbe4bd9ebe5305f21/73399655504.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bef85ebcdeaac80e6a7c8e53474b4bfe/zodaxolexuwovovadegavi.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vupbh8glb97qojq2vgoivpll52/57199838312.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f9a765655c826cb5685b7c0d5cf72a13.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbf16aed6---zalilenotawopinokuxose.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/00ub30hodd07rr0tdnua4f3i61/mikinalekego.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qm2l57h675kfh1k43lj0u2jh3g/31491276727.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/wojobigidigasipelurosid.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090108d266f6---8423056255.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e13204ee20a3c2621b23cb208c502fd/62641197290.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/84820313371.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nrla59n9n6bondv602m62l3vu4/jugam.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/26831338277.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/75837873392.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1f3c13c86b7240e62ba04ab95eb4cfe8/kibedebevokupukiwuze.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080920ce7430---filedikiwopogito.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/77045085424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=examples+of+isometric+and+isotonic+contractionsPDF 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_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 10868 bytes
SHA-256: f6470eecc0005ae592b489084f2fe191545b0caadc0a3c3cf60f69e824e0c593
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 17308 bytes
SHA-256: 0c300b431df43db835ef523d98c0ebb78853f9bb9cac6bba4f1a93535c035866