Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cae43d5d5cc5852…

MALICIOUS

PDF

101.7 KB Created: 2021-06-29 20:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63fca26942305780cd754fe79c41d3c4 SHA-1: ad9192e1459ce739e331cf64268f2f1eb83e418a SHA-256: 2cae43d5d5cc585259326cab8dee4996480d1247fa18f7007f3801a5539757f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a790847a9df---rabebepugatibopuxex.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1d998755---fitufamojebalok.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eigcchrnte1ff584uu940562md/buwazukonipivupidele.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/777954bvgue9p5hjf2e1drd2ev/garolobumu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c59dcc4f559---ketageruzezi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/medagemozoxasibu.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5f3c8f610c8a1248ff4963deb7be29c/jubijigiko.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a21c685cf---37026623906.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q46c2e1juo12apltd3jq778c0q/36405213571.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0046d9b6e---85785353946.pdf
    • http://cn-junsheng.com/upload/file///202162744145570.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd525039090---lojig.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p4o1r6fbgr2cjtglkp5qn2jec1/41969182271.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608400ab42242---92218504593.pdf
    • https://najarshi.com/basefile/najarshicom/files/xopegerowupovipada.pdf
    • https://ratco-hardware.com/Ups/files/94934167894.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607955a02f730---wuditeniz.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608406cb27a81---rimef.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4da6e0cf8---94242443637.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/72c619416f2a02d6026d939819887c3f/35882112269.pdf
    • http://poolprotektor.com/userfiles/file/nozubi.pdf
    • https://alteanetworks.fr/img/file/210024510.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+bloody+chamber+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a40.bin
2d8f2a5a744c5e3abec60c6068f731a7bfe9f4a7455d131768db0e3c656fb9de
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 10732 bytes
font_01_sfnt_off000142ae.bin
5820f633ed541010c66852103d0fb89a6a00d6f239a7dbe8e26e4861337465a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 17436 bytes
font_02_sfnt_off00017024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17024 16792 bytes