Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8faede82c330819…

MALICIOUS

PDF

117.4 KB Created: 2021-06-29 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10165d6201d02e24457c20ab576c3c05 SHA-1: 64a67a7757796aaef93266e78410dd25e01da959 SHA-256: b8faede82c330819632df0359fedc102f8a5401fd6d0ebc87f3d13711efa275e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further payloads or engage in phishing. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9eba8c324ed8ffb30d68a180d3447b0d/fekurusopozijizofo.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090113e26def---bipesex.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dcc86eab943204101c0c495e8de08af5/84275695928.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081725db5b7f---takin.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bcbb10a191dd944acdb5651a5863a8fe/5146616416.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a246619296---xivawosa.pdf
    • http://dajuicebarus.com/uploads/files/29974575572.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098261686f36---jotawifiwunitigomalowe.pdf
    • http://ei-windykacja.pl/upload/file/demozigoxogufijided.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/d0kupejcad956har5iumf7hnm0/manud.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/46724005281.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521dec65e1---butikola.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4648fa84f8856689493c7350c31cac7e/13983314750.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/vkej3c84g0g1i1sni8aq93r700/51910110420.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpso5j323isicrhtmlbbliqj57/senarinawexupenuk.pdf
    • http://cz-synergy.cz/data/file/58376646128.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073615c1c082---15451499956.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081661f60e34---sotekuwojodof.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7auiedbobcjtqptj2coekju429/zofam.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3862122cf365d2be49523f1025417ba0/45091777646.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4f49311c---41312352669.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=polygamy+laws+by+state
    • 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_off00016246.bin
9973f29574d8bd3d1eb917281f82f95df9596982e7f2e40e305f2a14469ec964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16246 17504 bytes
font_01_sfnt_off00018f07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F07 16792 bytes
font_02_sfnt_off0001a71e.bin
5d5338ebefa2c72e367c2bf86506ed9ccce519465674987784cc7d2e25eb725a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A71E 10496 bytes
font_03_sfnt_off0001bf2c.bin
411d1961f622ea44f18f6aee0e0974acbad05751ea470d399a647f289885cc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF2C 1948 bytes

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