Malicious PDF — malware analysis report

Static analysis result for SHA-256 8767e93e2165eed9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 14:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9d6e1d1ab29c90f9d7a6460e48fb2a4 SHA-1: 45f61338fcf86b3dbf296e13a026b85643d5747f SHA-256: 8767e93e2165eed9e61dd2a0b9c88f8e60a94dd6b56ab25c3b45a683b9155b29
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 CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest it's used as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=tana+french+in+the+woods+pdf PDF link annotation
    • http://interno-kazan.ru/upload/files/mizukutozove.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/sesitazal.pdfIn PDF document text
    • https://activepymes.com/pub/file/90952123514.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/giwojonogekasir.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba57c459f---31139010816.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/wevokubirelavebok.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ea7d1da7a---nozunefero.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/14371599841.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078179fa56ec---tebibelivebezowafigon.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/62589792042.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/kabet.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/5280954081.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a0643691---30792760477.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d86847262---wuxevulanew.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95783065385.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/pizozo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cd6239ff19e5f114aec55e2c9723f939/8821966520.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/29931d640402e422f9f6ecc60f3cb7e5/12003736774.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/duvuvumidibogaweturug.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/lamevilikupewowa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c410fc58e53823f9f6f9f5700f97129a/3266077952.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fe5ae309---64628345807.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/71039002207.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bceddd8df6473f8cd71e9631b4b904b/29843232089.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 17952 bytes
SHA-256: e44ce335fc179081fbb3d79931893c57a616175daa30412e029c66a2259b594e
font_01_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 10720 bytes
SHA-256: 1ee6987f9619f30d311c32ad15979c77619859870bf1c54cca12de1033c06d90