Malicious PDF — malware analysis report

Static analysis result for SHA-256 07733001c6ab1376…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 20:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ea4247072217a8a8b4a9482da0e73aa SHA-1: 56f3529edd8940f2a16fed10ad02dc4f89563809 SHA-256: 07733001c6ab1376b805ff304571dc7e12907fb2e3f5bc5e8fb050463bdb616b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=askep+meningitis+tb+pdf PDF link annotation
    • http://sanraimundo.cl/dyn/uploads/file/xitolututoladogof.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/12264684396.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/3799231315.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/59240220486.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f42437d9b5c---12806026053.pdfIn PDF document text
    • http://soles2walk.cz/data/file/numovu.pdfIn PDF document text
    • http://jfe.hk/userfiles/nivagifumuxoma.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611410d7ee2a4---sopuxiletar.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/zutunodujufo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ebca50ab---sutikuxifovija.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754ff8c5793---sidujipijaketorexagotil.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/156e2a160c363dcb227ae9ac3ef5d5ed/wugaki.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/15916152278.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/wimogelijowex.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebuvowubutevurakimas.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/5901732504.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/62011309341.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/67970339012.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b852926c2---96574233283.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/webafumixodaxenejol.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7e15a116---39668279355.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/32704075213.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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17360 bytes
SHA-256: ff360ce1ed16e33e6f6c960be0d42ae5788d6310bbb47bd8253c146d7fc859f4
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 10624 bytes
SHA-256: ffe8f1347fdc0fd4bc8d324bdb29b7affcc1f47a69ab52e4c82a4e17b1f496fa
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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