Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfd7363bf1ee988…

MALICIOUS

PDF

80.8 KB Created: 2021-08-22 05:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78cedfcca1cb7f21f910068d3bece120 SHA-1: b2c62cec44d87764de46e3599d2b589f63e4ea6f SHA-256: 3dfd7363bf1ee9887fbda6ac519414d8eff99829d1d7426e7e554db76175ca7a
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. It contains numerous links to compromised CMS upload directories, suggesting it's part of a link farm designed to manipulate search engine rankings or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c6349e18fa591201216dc0657cfb9db/58619492956.pdf In PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iqj08a0ch4n12l3r800u9pphr7/sulanupi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/megemanodekatis.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/tibetozitisa.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/rogegojedunuze.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d630820730---60275963663.pdfIn PDF document text
    • http://idcla.net/upload/files/solepizigogogevesimarekeg.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6f79747d---83949109279.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8242e46ee---49461515274.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vowabezesixijijidipo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/weguvabixemovaja.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/denikaferabagelimarazuka.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/repikonovupiseminof.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/89571349028.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06125ddb---63626529976.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/30089779803.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635eb28b72---tutalezavirikuragedipalol.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/58611556053.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/66863030698.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab409cc24---xegituguvave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+mod+load+orderPDF link annotation
    • 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 17196 bytes
SHA-256: 9f21347534554d0b0c6f5fa74836bf8b7e75ca690c7e9e9d79fde31c994c2ed2
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 10404 bytes
SHA-256: 1d47639e0cc7cea29288fa071650ca833463846b2e3724d10ec1059f210ad556
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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