Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d47dfe5b1b3a86d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4852103ed8b44fc5c6278691cf756a2 SHA-1: 41f411836cd610deba84736b0f076c6f80e9f94b SHA-256: 8d47dfe5b1b3a86d78c73f057b8bfc03d54b2d6f2ad2d466566b80b7019c7aee
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links serve as the primary attack vector, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+episode+14+english+dub PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8bf84e6fa9c7a5c7fe85bd892b138c/xowubamugarad.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/simudiviwepapemopuzuva.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/tivexofurudexoguxoxew.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0726d13d9---10848893844.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/57117717471.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/jupobavovarimixuxeve.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/zaxofijidejo.pdfIn PDF document text
    • http://www.polni.si/Images/files/werunaw.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/sizexobefu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/bijobuwifetuxopatubim.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pifemekajekutuxujoxo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/81306690417.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/897ac5362f24b7dccb51a94c49b1d117/75601605738.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40267726570.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/49402461594.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d0b0e5a4---93558510926.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/zagarufixe.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021972151474816.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xutuw.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/14527794878.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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 11492 bytes
SHA-256: 00fcb52135a71f064777d60cf0836fc46c639568da67eac0796e559a6f9b5db4
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 15792 bytes
SHA-256: 33ccaef5b9c8af7434fadc5294b0647d152470a3c712e7c700f7364b661ba461
font_02_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1