Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756967ac577ccde…

MALICIOUS

PDF

74.6 KB Created: 2021-10-06 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 43ad98a88e15de387b8bc4982077bd87 SHA-1: 7d215f861a2ff1fe2b40c7b1fa597e61b2113279 SHA-256: d756967ac577ccde76574939a60edb1668c445f731eecc2afeb02fda5afd82f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=winters+mourn+mary+stone PDF link annotation
    • http://besttailor.info/ckfinder/userfiles/files/nikuraju.pdfIn PDF document text
    • https://ysh.my/userfiles/file/33673858420.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/toderipevite.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/28722685103.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tizosa.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/josujoz.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/13316989932.pdfIn PDF document text
    • http://stisk.com/file/demetudonesodabonewezipa.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/tigenapugu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c8d6923c---64092047374.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/nibezadoliza.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/44434590258.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161502d74b7e66---wavuniwizegupojon.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/14156815252.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/jat8i8vv6mcls872klo9dm26cp/zamopajodetavemulosekodo.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/semuvuze.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zetawuna.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/51896988567.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/6725985393.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/wiwizibamemotepuxoten.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/86922686983.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613066ebb494f---74274523351.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff25ca180d---3508752106.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/26667321328.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c6f44b08---64995862189.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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 10432 bytes
SHA-256: 5889ce001edf1693f4d2b4c06223edb5af112607349b06d506f0fc068d2dd44a
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 17492 bytes
SHA-256: 3ab0ee94e6371abf4e4e20d2666fdae9163c2a11076b7f962353d17d4c7641e4