Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7973cd4f1cbf5f2…

MALICIOUS

PDF

82.1 KB Created: 2021-06-22 23:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb2f38a90b2f1b3842fb706ad8c45c9 SHA-1: 1b2a550d8732333bef98b296e24158b657b02fe0 SHA-256: c7973cd4f1cbf5f2e7565cfd81fa43dc82b04f8dd915e225daa508649bb58f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a6eb32ef---19934108914.pdf
    • http://ahcxdq.com/uploads/file/292034432708.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jqb2k2f66h501mqhfrv86fmhmv/28616555828.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb62c0ef9---67848780633.pdf
    • https://ktmcollege.org/public_html/userfiles/file/lebutuzabupukeso.pdf
    • https://werbemittelag.ch/upload/file/17201768014.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6b49bd7d---96793148867.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56e6ab65e---61965429204.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2249947a---65704615550.pdf
    • https://poolpoint.be/uploads/file/19766794163.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4247f9564259dfa8246bbca2f3a7e28d/rarepopenanenolefam.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baba894596b---78011898730.pdf
    • http://www.sport-konyv.hu/userfiles/file/41401217946.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4130f2uenrvoufmcbq3o2q773/66966555428.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4g064e60mlalvhhdgfnt6q239n/moxefigufesufopaketuvofem.pdf
    • https://jahanchart.ir/data/files/file/pemizepidezakonibugaviw.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083968b178a3---gewizidak.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/naqsnhamavl48otgehvk22ql0a/ritamutizotojelezebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=daily+chart+gold+price
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b1.bin
38dc01e62ff5fcb9d1c471da5d3644c5a541ae9b0fac666fdcf74446f4a74f82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 4940 bytes
font_01_sfnt_off00010798.bin
16403bebea2f9e7425107bfa6e6d3dd92a90d0214f1734a9db16cc82e4a1ddd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 11036 bytes
font_02_sfnt_off00012d3d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 4324 bytes