Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f74ef6ce4e69fb7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 00:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013c966f208b5e58a89fe278c91d2260 SHA-1: c5437b97010a9b84d2e5d584e50f443a0e9bce72 SHA-256: 2f74ef6ce4e69fb793d8d79718f697f92c0c63bbd696029b1dcd0eb65200d0ae
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://ks-system.co.uk/ckfinder/userfiles/files/9823287959.pdf In PDF document text
    • http://cnex.cc/images/blog/file/jimadatifegivuni.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xodikoforala.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f4dfabb5ccec3f79d46575aa6158198/19863627844.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/38018060475.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/fojoxib.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed269010a---remuborigevamirogozozu.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/96708209254.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/07b6cc96d028794bdcbf1024e51a84c5/13118019923.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/38364031089.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/77941584711.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/82069017451.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jamosoxefimukopuge.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0c4235f2---40120695933.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/40316830991.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/37961074318.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ca6bd89f7b0912ee1b8ec392087e21a9/73031564512.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/34780132705.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fc631e10fae7152d2bb6906ae2292f2d/boxunuwesonikegu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/58604257522.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/tobovobek.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kezupotizafezorumorisiguj.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/gunavepow.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/34094443975.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gurexigapozinamurimokug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+mockup+generatorPDF 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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 10816 bytes
SHA-256: 4e62160b7d63833626a30d51fb28f7c715cc7c99b4da5142560ab6a9b4abd236
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 14872 bytes
SHA-256: 6cab80b35aadc53d012d2803b45b461362ead8f2e66d6890af255fb24c1fe3ab

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