Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4673af671ba37fe…

MALICIOUS

PDF

141.4 KB Created: 2021-06-30 10:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25090aaf1b50af39e232885a7c1ae98b SHA-1: 6be7eab67933d59679673e3d94b8913987d5d1fe SHA-256: e4673af671ba37fed3c782c2631254310fa19e4d9c42468011aee6b185d66647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfec39bbe8---31127284858.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tuo2bku839cc2su9m119ahs02u/21077256176.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/97024852ac7c80276531e286c3897303/23948291460.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05cf55718---24594806370.pdf
    • http://www.lugashotel.com/data/editorfile/rukojevedixavagimogumole.pdf
    • https://airshow-bg.com/file/pajemole.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b958c49ca7bfb9324c9befbd5879d95b/15325617592.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8a66ce9e---87911712579.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71b92d9e5---20014864206.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e1f38bae3d6742bae90c894c841472e/38668440462.pdf
    • http://sushinamu.com/uploads/files/xapetotosoto.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9lnhggtj96d1jhbiogqpije4ss/narelepesev.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vrtuur15p3tpcil66thutgcgpr/11493572412.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729086cadf7---49570384303.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/wonukaze.pdf
    • http://premium-t.info/files/files/18455017086.pdf
    • http://aarogyamedico.com/userfiles/file/doxunevejijatamato.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/37207521361.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cscmmsh60djjat35ig45smh4ff/vofuremafumibenuni.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a120e7f5f---fazadax.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823d984020d---24385973170.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5ff52964dd---junisugaxolox.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3205383d2b---tenukegonamafadutewejo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=paradise+fingerstyle+tab
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A297 16792 bytes
font_01_sfnt_off0001baa8.bin
5e36e8fddd0733d7ab69a0b40d0b1cf4e7b7f386bb1f0855636407ab131dbf96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAA8 18916 bytes
font_02_sfnt_off0001d905.bin
e80f71bae88942b2c0c7f212fcceb8dcfe07d0842ed93373d4ab128c5f34a52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D905 21060 bytes
font_03_sfnt_off00020dcb.bin
8d7e3c0377b8df195096623b2575e177f0433b7d409705ab5f55ed28b9005546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20DCB 10664 bytes

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