Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f68b5201729d49…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 18:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 670bd97ca022e236c329fc899e16e874 SHA-1: 6c50ab695a612e60d204c969cf2f440bf0b9a5ce SHA-256: 51f68b5201729d4932f05c0704c82ac1cc280d75ff2f3981e9c55c34474d6353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://cructi.ru/uplcv?utm_term=epf+uan+number+activation+process PDF link annotation
    • http://yacpa.org/yacpafiles/file/99691831517.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/sifowisotomewimimesuba.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/xibibofido.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/61378644750.pdfIn PDF document text
    • http://funperm.ru/content/file/wajosonuwaxikagejupe.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/jaresipitemidumoxiz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4617bb6f---jefepemejewozodidaviruvo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/23571320843.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e2c83912---gafinefazujovefixozo.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/rafelumepon.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff469326856---ragijus.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be481e14b54---nexevetijodep.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/66622069033.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gizenatiz.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/27758708690.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/papaluvarenawuzup.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160802fa306956---99117526595.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/97f82af9e72acd5c9b7c859863a12265/41362232284.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/41208449320.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051619524610547.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9bebe42f40f76b2ee832f19db5c48f97/ragobo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af2b6849f5f131624f91eaf9423bb0b8/mifitadajazubo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c48a197f8---13322955041.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103b341e0e---mawoxone.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/67379570473.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB598 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_01_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 10884 bytes
SHA-256: e2cc60209ffc7db47249c054774a4ebed232461ebf7c9c3ee36a475ebfe2faab
font_03_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 15392 bytes
SHA-256: 7990470d8a22df1d8d15c940ec0d11b894f5c8d57e4a7831ba112ea7cd46f708

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