Malicious PDF — malware analysis report

Static analysis result for SHA-256 0863fafbea063838…

MALICIOUS

PDF

93.5 KB Created: 2021-08-17 17:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e727994c4a0514746597185fcd58bc0 SHA-1: b9780555a9f0a46be985839ec59d1e3ceecfc50b SHA-256: 0863fafbea063838c17866e29d3d40698adb739d845b05dd19e0c8379a6d8251
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nuraski.pl/wsg/userfiles/gipududewujuk.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d60c68248---tajukotexiv.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/5a62c8b4c4f2e384056de3a0832a3b4c/24010945310.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/mowam.pdfIn PDF document text
    • https://nada70.org/userfiles/file/70298309845.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0616fb6676---43644779893.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e0251a0c4---39744877685.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c7b7f27fb48---51182494602.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/boxopadoxosowa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/08ec33b771c3dce962ab32e5244f8718/bafamodazeg.pdfIn PDF document text
    • https://actorconseil.com/files/file/86178037364.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c675153f85c---5919806890.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/56799712682.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6278ee7259---65863650960.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a20268c7---40458193863.pdfIn PDF document text
    • http://industrialdevices.in/uploads/22344509638.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/33442750614.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e128e27d92c794c8c1f3c8fea7728cb/zigevirafavozud.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fiparurivuwufuted.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/cmkvhvplkdpjb4oso2rl19817e/45476762348.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sk08bhq79nasojvsdknldebtuh/94046133353.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210617200428074.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/lesejodumuvogujar.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/pogafobaxozibanolotonaxa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096aead4270---nisefesen.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/63479152082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=aida+model+marketing+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 18496 bytes
SHA-256: 2a236fdc3a359af4a26e38124b0c005444c7b746f9ef31a85d57e5277706ce67
font_01_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 10744 bytes
SHA-256: a6dd265d1b6e290afb4f9aa528f5d7f1299e64a8a7dbd33d79c5a0a1cc12d0b3
font_03_sfnt_off00014f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F79 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516