Malicious PDF — malware analysis report

Static analysis result for SHA-256 82063b51297037b0…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 14:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1935110fe5b3382951f5434b9e089c8 SHA-1: e33d854567e0371328fe62035c16bde11079659c SHA-256: 82063b51297037b0e1a53a38ca0c5009e4db212185d84f697b92e6b4c6512a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, but the structure and URL analysis suggest a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/cb8n4um2vaudjbumbbrbkabvpi/xegotibesop.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b8f351674---99073934444.pdf
    • https://retta-bg.com/userfiles/46756466354.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/58246a3562b19e98d06426143c425dcb/93243703407.pdf
    • https://gites-les-bardots.com/userfiles/file/97813366443.pdf
    • http://mazdooradda.com/userfiles/file/42685552674.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/garuxijolag.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c737e9167---pivuvutanopamu.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3022983830f054cf3945e8b695a69cd6/68203084085.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9u07qlhagfl95spmosr7mum9l/lurixerabodajefezozitoso.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c56b88b6f0---levifibuseguneriw.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86823da61---5473966714.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebcf0e89c---10512813084.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ip9k3rb1pjrn7pik4dascvhtin/xoxodovafosodumixedo.pdf
    • https://pointvirgule.ca/upload/editor/file/libuzodemifupalirix.pdf
    • http://nesthomes.in/userfiles/file/92936769579.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ib+extended+essay+examples+business+management
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
font_01_sfnt_off00010a62.bin
e7e3f4e2a41b5b7f9808c14cc5d95f3bf32f41b14bae126660cd574e92fe0c99
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 17272 bytes
font_02_sfnt_off000137d8.bin
900154252c2477194b1521932a93ffc6493c6ac39ed6c1b352638845c27defb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 10924 bytes