Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b92582b1ea034c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 09:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a16d4205db1663f385b049b39e831f99 SHA-1: d51d84146942b74d8feeeb38026b8548211f7abe SHA-256: a0b92582b1ea034cc3f4ea40d5bb62e53d935657255caf6f3e64989798e67e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://prospr.fr/ckfinder/userfiles/files/divusepimuwegagotaze.pdf In PDF document text
    • http://mdfgiare.com/upload/files/zesapomekilizixop.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d0dd6ab88dcc89cae20c40c4e8caa197/13131428734.pdfIn PDF document text
    • https://agermag.ro/mm/file/tegakas.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/13106609147.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l94urc6a7nh3g4agrgg3in9ecd/44873415890.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620187ea1---40110637366.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tupojadulogigu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/60972568480.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/13379110134.pdfIn PDF document text
    • http://www.toptehnik.si/images/99853993695.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/8597658224.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60798505695.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6d256670---rigaxegelusukeguvotaj.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/44340435219.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/13255968471.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/71704207401.pdfIn PDF document text
    • http://anpo.vn/upload/files/52504705698.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/xorifinevop.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/97228334548.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/xebexusuwekutujexegibiraz.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/fagifira.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/voles.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/rufiguwufixuxaferevat.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52419014657.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tijuwomizaxetilekutataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+emulator+for+appsPDF 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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 18896 bytes
SHA-256: 369f9827ea69042c21a57317537f5c2363f71be334137475085b684058f7ea3c
font_01_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 10476 bytes
SHA-256: e9c0d159151f3e9d387c8ddb65efb4eeaef715493413971d65f55620ef916594
font_02_sfnt_off0001425e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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