Malicious PDF — malware analysis report

Static analysis result for SHA-256 5730208dc3cdd8ea…

MALICIOUS

PDF

76.2 KB Created: 2021-08-30 18:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca26609a390bc10188ec01f79bc75f52 SHA-1: 971a505601bb055b342dec425a077ed70a9dec03 SHA-256: 5730208dc3cdd8eae88cdcb0dd4371ab27ac8862f69c8494e07bcd2ac457645e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'Fake invoice / payment lure' heuristic, combined with numerous embedded URLs pointing to compromised websites and disposable hosting, suggests the document is designed to trick users into downloading a secondary payload. While no scripts were explicitly extracted, the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oniceh.ru/uplcv?utm_term=a+set+of+rational+numbers PDF link annotation
    • http://irinaburmistrova.ru/files/jebuzugon.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/83725882749.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dacd8401350---3325178230.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/sofobinefegepajoj.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/xigoxudofusijogugotarel.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59bb6df935---xuzufijamuxiterur.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ade63fae---59624701625.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/lugukejajiposezidekimafi.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36315579409.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/fojowaxojijiku.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fujovozapinujugitifova.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/kufuj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/851a23a93778483c644864b89e95c90e/burifedibalufelisi.pdfIn PDF document text
    • https://luminex.pl/upload/file/54023301433.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9rs1t9upb22qh1ifgl04vig9q2/49664853214.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd14acd89---99945870806.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/petofetajuwexarewad.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/bojujovomapivepasamasot.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109208b65425---12727423824.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gafufepadedebaweronolov.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a5c5bf454053007de471a4875fa42704/minusajazametewafasaw.pdfIn PDF document text
    • http://oodow.cn/upload/file/2106272313166351674hcmx4kvjdlh.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gukevubaja.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cec278b3809c01a0c72a97803c7fb273/wogur.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c95068b1---pefemidolija.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/83330456121.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://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_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 16444 bytes
SHA-256: e5b00dafb1c05b39c6dc99dc1bf02bce86fb9186d1b1195b73cad1f8722788ca
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10596 bytes
SHA-256: 9ab77ebeabaacba56c9b168b7ce2c6c6142731b5491a76df9a17b0bdfc536129
font_02_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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