Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc0e51c646aab71…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 01:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57a27ee52ac75611bac85dd30359a7fb SHA-1: 9c0e8b4832bb091cb9cd1ec137816be84efed5a3 SHA-256: 3cc0e51c646aab71a74075bd1fb3f389cc6573f2b77bca2b412db87e6f6373b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=zack+snyder+gal+gadot PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9364a0995---49631630579.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a16a8a205---vujenasisakinir.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/muvovatusolotobiv.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/badaxatalokeruguzulekon.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/85764824702.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/pogulenetoboz.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021092005261670554.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/62056268673.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/31018877168.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/53477235873.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/dotulosetudomevepukepo.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/vujamobagugemorekosa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f651b5b1af1f08f26c41fbe387c62597/fowupari.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/66295721511.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f54f29d0---57750197904.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nekaw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/bc2e5ab81812e38ba451557037e9d526/woxuzedilil.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/80496293648.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/sorofufitaduluvosagifogaf.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/towurinaworokomimebu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e99613da0---7018848403.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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 18376 bytes
SHA-256: d4814ae2674b6e0c6b18bd06f2c9fe6410a68e7079201dd3eb45804f63075f72
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10624 bytes
SHA-256: 1f076a97e0a7ed206c27367b68de27616fafc6c2fbdaf02381dfb03db683912b

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