Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce004f2a734fcf3…

MALICIOUS

PDF

116.6 KB Created: 2021-09-05 07:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ecfb6520826f0ae1ad9ad816ce778ca SHA-1: c565f7bea3e2e929946b7a376dbeddfae9971cba SHA-256: 8ce004f2a734fcf3432ae147a18207044e2ed529452d7596af7131373baf9fb7
154 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 functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8122

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=le+f%C3%A9minisme+d%C3%A9finition+pdf PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/faf17e4017a9baa2d4abbafb387e6c47/15951752121.pdfIn PDF document text
    • https://dm288.com/slicice/file/78629080871.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/9544346177.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/94650304957.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d98fb4f2c---19723308514.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/93472649303.pdfIn PDF document text
    • http://mp-journal.com/media/file/funexenorijadogalemod.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/95914385838.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d320cd95---memulazexunotoxev.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00ba88f0d7---gijinumorevamelulob.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ti3pgaptn5budtnba6jkitvvt5/duduxezaw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4a7262df909c3de2a9c895006ac3434a/limisejijuvegedikokunemux.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127df943db5---2077811097.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2576f4a3109688c9b6b75c717bc721a6/pirononikotavorijolam.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b856d86d77---92812948585.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/71919197655.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nemut.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc4d3a0c0---2444845277.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/44f0ac19dcd16663b863bb436ba83e29/borimumogalemofovu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37946ad58---95711738597.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a153095fe99---59540061542.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fd7f913ad5f04b8c48804b2d467c8cbd/7813320449.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/xuninaxazeza.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/faliko.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B186 10464 bytes
SHA-256: cc5888effeb7601cab9b6137529db383bb821772ca6dc3097995aa743eca0ca2