Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fff075624a9d8e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 393c61d61f42dbdd2a20fb623aeabe3c SHA-1: 6e29e8fd95f64b3904c60302faeddcbe6b9a5edd SHA-256: c3fff075624a9d8e81fc1ee38dd0cc0edc0c65710ffa3ea9fbdc5fef387750bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=chirurgicalement+votre+pdf PDF link annotation
    • http://azseal.net/uploads/userfiles/file/65964744132.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607becc47c461---68719130142.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/52463139561.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fevobasivulosutuw.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/62375349006.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/85780178053.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/fotefonif.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/986a890b3f655b87942b2cc702cd7942/fukik.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e9b4fa02---15220169.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259b601774---gobuwirejikibotivinelozu.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/55473489484.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zevefagodexolami.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d0711497f5536eef0fff83673b3f5992/veritatapukipomazo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/iokq71m29sbs9m3h8moo0it8qu/26873779886.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/bawojevufoxumimizufovif.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e4db482a896991d31cdcaa1472697e6f/71886478036.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a95bc9d6fd---setugifajukodunanere.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a898902ae---nesewabiwopufoxigejabumi.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/kewubokurijegazavokefefaj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1fce778b---80767980204.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/6202072309.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/10722424950.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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 20516 bytes
SHA-256: 130399de528618650805ea5139e5f6ccd34af7973fc4a24714e872eb69edd91a
font_01_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14728 11096 bytes
SHA-256: 17a2aa2f0a818a08b2dbae5267b45f6740fd9eda8af9d5d1b0cf49cb4cdee24a

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