Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8794cb34384ca46…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6e704c7350e508c6f02169dda95d6fc SHA-1: 396a00c130bb071b0508f5b3c4e8efcda740f530 SHA-256: d8794cb34384ca46d04899c4348237fb26153d59c5f82755e77fd9fd35ea6dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://smidgel.ru/uplcv?utm_term=causes+of+slavery+in+africa+pdf PDF link annotation
    • https://igruppe.no/ckfinder/userfiles//files/68521671094.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/71776381430.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400d130746---65976053913.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89cb1b799---fimuvilaturezit.pdfIn PDF document text
    • http://kfbi.ru/content/file/zadugefitilipejebasovat.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/rexijipesoxovapojawuf.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/52216212418.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/kisijabofew.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e2585e3c9240c861c9f14da9a9b0f50c/karoz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e023d218---8143047332.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072517150301---vunasini.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718976abf4f---dinaxoxajikuzozet.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f3d003fcc---55947888109.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90c33071e5---10617960340.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/38322701989.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3ocfcdl5tcuf0ve11as5roabc5/13800821061.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/fiwadoliwiluz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bc39e11bbd624013c6747a4858efd8aa/gadoderebumazoketiv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce14437e5e7---wesudosuno.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b133e3b627d---tesivuworuxaren.pdfIn PDF document text
    • http://midel.me/userfiles/file/nuwawonedepijebe.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kurij.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sabiviwox.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_off0000b914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB914 10828 bytes
SHA-256: 301b556422fec154180a672c294b9798cb992b950c1809597918b2d6576fa5c2
font_01_sfnt_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 15860 bytes
SHA-256: d888fb01beb6d6a2bdd6c0a2e12064ae31995f395dc29a85731292282a897728
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.