Malicious PDF — malware analysis report

Static analysis result for SHA-256 750618f544a0e4bc…

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 09:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4845d50e1023e7e69b1bb3bc83b67ee SHA-1: 2a4b148594f711df0987a31b57f1ac20a9b5ed13 SHA-256: 750618f544a0e4bcb6f2c39ae53449916042040916d0659eb9d2459cca17a4ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or redirection mechanism to phishing or scam sites. The presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crysiq.ru/uplcv?utm_term=the+world+government+pdf PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/38320762375.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f9754ab9---wudez.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/968513928.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c45c767f08e57c7661e5080ffbedec94/masapuzivoti.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/38348574462.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fagaxozamuloraxasipepupon.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/15152636765.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/wemagugosuwizoxafurop.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160860ca79c8e8---fenijuxezenu.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/53425761489.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/61b97a1763d4bf10c9e2a74fe0f6cf4f/jurekedow.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abbcbfcbd---11500463662.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2a14da5391336832b9907050f49fc3d4/30779514055.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/utjsanr09upnogrtrp0uogc380/11811560726.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sorixotomud.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9680f90f9eb4bd18535fe1da6e14f2d8/sunaxidizusi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb78871ad---15766041838.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/ninadixomurajuni.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///bofufosuwufevoxa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4477a9919d---35774013420.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c72e448e7---defipexolu.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/julok.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/disevup.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c738ee4e03---xukelat.pdfIn PDF document text
    • https://razredna-nastava.net/files/lirofazepu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/30336647216.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_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 10636 bytes
SHA-256: cfffdeeeced106bfff65b5a5c634aed63f72bcd08802037cc13f287d97a6ee9b
font_01_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 16612 bytes
SHA-256: c04b4042eeeea5ab7b5f73edebdd600143357bb02d6bfd96228854de47901d56