Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e15ac9b35b5e3b2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 14:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 873c45af03fb7c3537fceef0ba77efae SHA-1: 84bc1a6e6a35102f1ef8c80842d48cf88a1a4b4c SHA-256: 1e15ac9b35b5e3b27fa062d666bfca0e4906893b8d0bba0f7e86ac0f9d6f5b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://livres-d-art.com/ckfinder/userfiles/files/32953083197.pdf In PDF document text
    • https://menu2uplus.com/images/file/vesibelemolivobukofow.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gomatugejozi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tecrqap3vhgc8aipf3dpsi7epv/moxenuzuvurebisavepu.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/50683503715.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zixidataxovifuletagavatem.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/68595302446.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910110047.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4899c912---deluf.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/novanazadebubivon.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gebofimakarimof.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/470d30d6de24bfde6b425d91cd0226ac/soxixotijobodol.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/81686866423.pdfIn PDF document text
    • https://lesura.net/userfiles/file/85059049742.pdfIn PDF document text
    • https://udruga-invalida.hr/files/55856007716.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vutotakunuvufo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/powijadajagaxa.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/62854348400.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/35841833289.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901072845.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/57173215056.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e70d31a4---levimow.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/luxibazipe.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/zafolifosepameruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3d+wallpaper+hd+for+androidPDF 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10488 bytes
SHA-256: 5a835876c04a8bbd794e0e43c71bb7db57775a482c57b792952941390811d90c
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 18256 bytes
SHA-256: b6d116b813ff1858126930c2ea056f358ef224a67b00b8a8ab9bbc33c064e22b
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1