Malicious PDF — malware analysis report

Static analysis result for SHA-256 399577b629f39047…

MALICIOUS

PDF

80.7 KB Created: 2021-08-07 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef26fa32994709016d11b1a0eaa8aab3 SHA-1: 5c406a977486019da3b8fdceb5d9809849e70955 SHA-256: 399577b629f390473136bf6e4e90da062a1677e287aae6acda6ebe3090eed6b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these link farms. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7ffecf9484a36d67cd98f3d617764ed8/22918628227.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vfgivvmugqoijs9vtgokgggb2r/wodulegixe.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/15788134196.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/09e3490ba79e31598b5ff60ed0c04ab7/98335963745.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c7b55e54---61328133804.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/mugoxaraz.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/ravezoz.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/39894531622.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/75993404358.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9gh46igp1srjn39gscjkl285c7/42981379630.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c8e1df06a---15788227593.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210708074951.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db75545a31f3aa59afe0708a341baefe/duvakitesazaxifinafes.pdfIn PDF document text
    • https://norservis.info/files/files/zigul.pdfIn PDF document text
    • https://ekransamara.ru/files/meposes.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sewolevixadi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d9d1fde6bfa4a7c7a74ec46b159c1b17/dumiwezixokewometamagos.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/32070605416.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bepologopufizepulanatodi.pdfIn PDF document text
    • https://congchung7.com/upload/file/32518003486.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1f1c28948dc6ff4246a293503ec6e8ea/49628482676.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/roxexivatoburujigilive.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bm3ftjcl19fvgupag58o7ono7h/lotuxifefasewugedeloxim.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0atuhhqetu5l7dnl48v253u3ur/15054616189.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/97936337702.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/58187736446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+actuator+valvePDF 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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 16468 bytes
SHA-256: 2ec244fddb7ce270e7f64b396ae6d1e2e7066630201fbdfdb436e07cc05e6c3e
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10492 bytes
SHA-256: b05c3675d9137bffcad87448f5d78be523cdc81f2f2678ad68a79a1bed475df0