Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bef0c5b173693ec…

MALICIOUS

PDF

80.3 KB Created: 2021-08-21 13:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fea2d56bbb48252bb7799e9a422f3a9 SHA-1: eeda1893261d0ad4d871f15b1d0896b8ca72d971 SHA-256: 6bef0c5b173693eccefd3af013cd4954564a532f7ad75e8ab8e1b3095833977c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=software+testing+book+by+naresh+chauhan+pdf+download PDF link annotation
    • https://adsbudget.net/userfiles/file/18688623527.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73754169503.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc9145fc1---37364754778.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/49154296876.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b4ef2b68e6f8991a8676aefb445589e5/4141806602.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/79776201470.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3a7950d8---52674321488.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/90780746140.pdfIn PDF document text
    • http://irollee.com/userfiles/file/10978155011.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/forejofoz.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/2001776483.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/bajolusifig.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210623_2D707EDE040E73A7.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d15873f85---sosuvisubimo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8c2ielb3orqv2r4ag5s440kgh5/befudizipefepiwoloxe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l9g8ngk9fif12epm1lbu4im88t/27285382694.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3df448cc5---20815960359.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f7a381de95bbf01d6d68a82b6545d947/92428057328.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c5c93d1d---sinopujawu.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/pokitu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/23606508188.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/xubataxawibuwusubu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/womarotajimidigekasurebu.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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 17412 bytes
SHA-256: a2673cdf84866f8a0ddd530a3d1a6cd6d69abd3cb75a181d4776d1ff063693c6
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 11504 bytes
SHA-256: ba1a6b33a9c62901892af881419f05ddb229cfd959e9c12871b50daeaf3a5f9e
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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