Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3675e3861c0f91e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 11:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 225be893afc9c0f4a6a7123303e73e0b SHA-1: 242cccfaa8ed7c2aba3bead7afe13dce989b1468 SHA-256: e3675e3861c0f91e76846d4aff9e4b688c05d2bcf4a91b3f9da35d95640a0737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, a common tactic for hosting malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it functions as a lure, likely leading to further malicious downloads or phishing attempts, aligning with spearphishing attachment tactics.

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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h4chq1d6esrdn3b1ika53u6te3/96356071789.pdf In PDF document text
    • http://ainut.fi/userfiles/file/zatuzupesakulosidarep.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502085414105.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/4752486116.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cn2otbahujdvsvltfp2vfgps8i/rewekenobomez.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xuguvexarabogib.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3be81c159c262126c4e587a072a4e3e/fovakapiwow.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sisovepet.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mujoxugidotijez.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/18304922327.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nijego.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/93951822235.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc006176fb907ababd18217b587c598d/84810230795.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/powobumozivuwegesabap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wii+only+showing+in+black+and+whitePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a48a36e0d83daef759e1fea6fa8a612b/87775445651.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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 17592 bytes
SHA-256: f637272044e8795198644500d82097fe287ab80b7b7bdbda4957542d9f347b8f
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10972 bytes
SHA-256: 0d732b6cd85e86bc7696ac597ec8c4a1234e743403b21b2f310b380c9c3a2cf9
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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