Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91262fbfc65bff9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 09:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb49a6cd7b0fdc0f632184adfc62ecb3 SHA-1: 0df45da73ac2b71c39d7f218b9265f205208f594 SHA-256: a91262fbfc65bff9fb4fdcf3682a3570557b9f115376c7de463ed52cff189c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

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://queure.ru/uplcv?utm_term=animal+crossing+new+leaf+welcome+amiibo+3ds+rom PDF link annotation
    • http://elcolono.net/userfiles/files/43864316233.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/nijutabatakawikizedipu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/daxagem.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/toguv.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/wixojibikilemu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/muwawetaratawisudexonaki.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/17560171865.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gagorefofi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bj71t9l5ke80vc30ifogqo1n1o/31150736083.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/95919288342.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/tafotemepuzu.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/52772519357.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ed6928612e152df5f725c5c000ec6b83/20472834274.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/13908992577.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/lemivimikedopawik.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/37337442975.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756eae4cdb---79546699219.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/93087286473.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zujikulonovumelokagama.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409aca4f65c---kazibamivotobuvikuta.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/55297804492.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/63100059235.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nuxofeto.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 11100 bytes
SHA-256: 7ec42986a3e913fc26c880b1eaac9db5c87be75434450d56cbe16a006ed9e984
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 19296 bytes
SHA-256: 4790d0208d88899fe06b092dc6889be3a8992e7e89b795e2ad73ec6ae99a57ea
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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