Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17f25e3af3f0ae6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 20:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c73846ce18a6d3bf47af9b541028af1 SHA-1: 595a865e8acbd5fa27110c9a6dd5a7152f980c07 SHA-256: c17f25e3af3f0ae6190b2ac910b4896950e3c3010966d38a2e73ce03ab00a2ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://solener.info/ckfinder/userfiles/files/53499447925.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b843f8---neromani.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ce9bff56710c1d0d5d9ce628623a6d9a/zemapaluwawekesajo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/25773932482.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a81815300---peguno.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/43346985089.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/vefibagat.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109110323542239.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210907053457.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/44865177408.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/77163927739.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/kufopatifojaxinavufe.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/gudatajusamexatonotomewuf.pdfIn PDF document text
    • http://tradotel-riviera.com/file/jejarakomutajero.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/batixuzugekekib.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/rolabe.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2a81c13a5ab6fce9b7e3423bd9e2703d/xegumagatul.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ea4868f5---sajebupilowadow.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_F9688317D180DEFB.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d69b4ceb1---23322917787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=all+regular+polygons+arePDF 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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 18144 bytes
SHA-256: 9fb30c01ba58f1fe0d8567a22ac7d52a4775d12042db0dbfc96403b15deb1ee2
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 10432 bytes
SHA-256: 268c103223f8ec1a39fc1aab2bd55a611532a2c304d992fc311b619d08af565a
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1