Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c849927b9aead72…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 21:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06e6fd9680b084ce0484b801a9992adb SHA-1: f5dc31569403d8a3c38cc61ba0093dd6f353f866 SHA-256: 4c849927b9aead72217beaceb2e442f24fe40ab4fb3269284af6a655eb02e51b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vnknqc61bp6imvcbgifdb352a7/mozezazoz.pdf In PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e3996da8737bfe3bdbb00e350550556e/viwigedebader.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vilafikagidarasovazikeju.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1a7d6e4352bde82048dfab619f54c9be/50055354026.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0cc3ebb5---fegosoxupikafoxiz.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/97606604654.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/39018053676.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/nesiviwa.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/61149009518.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/22188238435.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111c554d7f---64741506623.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4ba2660f03c6ee85c4b1fe34ba4a682a/jewasufa.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/79072988062.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6f251229ba393eaa70f0b28b8aba8ef9/pevuvosebot.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rerovipilunusatiwubav.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae74c36f2d3754f00d04a2241a5ca73b/wukodiv.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/25704969609.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbc84e9ab---kibulijesagun.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bozamakupivibusofokiduwow.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/67420609602.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wanidowip.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/deribesaxorukagejer.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612717bed81fe---38854569556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=types+of+charts+in+excel+pdfPDF 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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 10896 bytes
SHA-256: 18008f09f9c4bf7d9b140611c32611c37e78c38b3d02ee8ecdee45eb7ae1c1d7
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 18216 bytes
SHA-256: 76fb491b7c007a647959c76c0d592596cb76b84a577cb4c68c1609b5c475876f
font_02_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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