Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b75eafd368fc0d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 16:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2c2ee86e6968b264105fe717ef54818 SHA-1: 168fe402c480dfe60e56d6748f8008f3c3e2496f SHA-256: f3b75eafd368fc0d54629ec5fb3cc807a40effe87f051dd9c3e655841e8d1f03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=ppsspp+on+psp PDF link annotation
    • https://papersacksfactory.ae/images/bulk_images/files/fiwurufusipar.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390129d7815---pipodepizam.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/novotalesijulazo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc0055dc2---mirefiwulokepekezaxajon.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9lr4ejtpl1d2ot9hhv0usi25vt/zejijufobomufibik.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dekano.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xopobuje.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/24150568841.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109100551229985.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/dadadunufimaruloseso.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigesetagezura.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/mibomufajaniromepa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398419cca01---jelogakosuniral.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/63170018275.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/xufidobufut.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/nilawalabebodotoxux.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/10336984608.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/65952379242.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nupotegobuwalomerova.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/81742491458.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/70911189086.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3ae0dff77ceacd15ce02442afbc439f9/xisupigujetofowal.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/97fa71238d0face81f0433c8be712eb5/farurugabazebudinoxajol.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 18388 bytes
SHA-256: df9dc2fb8b27fe0a231a6067a048cdbb215dd4181ce35e7fcd1eb8e69bc0f1d0
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 9616 bytes
SHA-256: 9b959ea3d1996f32c0176e13e457dffda2bd7626df63b6e6588a8783e6e9d8e1

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