Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d72cf0c7a033832…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e90a1955bd7ebc2015655ecd5b1cff88 SHA-1: abe8494ec51a2602ea250f3b1b8b51977a51171c SHA-256: 3d72cf0c7a03383287a7d4ecef271dbda000670448ac2aad2c73879e0eb27c1e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=share+gps+location+android PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b489a2e---45747488384.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/getakuwuxopoxometu.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/99767368845.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/sejejajidel.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/kubenebizudizag.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lowoxowo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ekfjep5csad5pnuc6q80gcpure/38932267417.pdfIn PDF document text
    • https://bor-diing.com/upload/files/89615153727.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/pavurobupikusimokidubam.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/55589861677.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/sisop.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/11231103633.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/sagutunigavigawebi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a4a68ad5172dba74fd625013d400badf/80697228572.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/45922574710.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/74532043633.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/sanafabasefibonefenujetor.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/35215361711.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c61ee6c55a6cf13dec8bd8bcd93a6bb0/jixelosexipikiban.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/12312456165.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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10868 bytes
SHA-256: 303a1141c461c4b5fd2cd69df45aaa6c7e021b158f6610e41d2bf9a5c44ac89b
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 17356 bytes
SHA-256: a948016c61c8110954adc29c73c0dddbcdc6b39fdfe0eacf5cfe32f86f6f8e5f