Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d82191b6d04274…

MALICIOUS

PDF

90.0 KB Created: 2021-07-07 00:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b6b9092ecccc2b0e8ae53ce8a61b782 SHA-1: dda8f96efa928baa6c1e84a90b11be701f9ba0bb SHA-256: b9d82191b6d04274f59c95ecbef781bebc0428e430d46fd673954507de3067e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da7a63e2a08---jewatidabunabepujavo.pdf
    • http://loveperfectionschool.com/upload/file/79958419642.pdf
    • http://ksuskalology.com/images/file/86602911459.pdf
    • https://alarrabnews.com/images/content/content/file/lexidebubuxiloso.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31fd1cbf56---83373926158.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/xovubevuderemijepeb.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db44199925e---98440800693.pdf
    • http://ecohort.com/userfiles/files/momenod.pdf
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/risokifivudowuloperev.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f12a6639f---xovegowivinuwiwuja.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e268999d69cdfb7a64c391803863d2b/43969825165.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c94412374---67861152137.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e658225d---medore.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4c7eadb2e---xolaju.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//67400380052.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rtr3nu61tn58g0qim9jdvmkvd5/5162902338.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/68bb9e2b5e7dafd8f180e0ea6dd85716/13649089933.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bbdd18c---dagisalewuwanevezemexef.pdf
    • http://bebelino.ru/userfiles/file/55763184919.pdf
    • http://sity-luxe.ru/userfiles/file/19813312109.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075e54504---55264916408.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17b893148---fujavojefa.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/heq47g6t6s8hpfpf2k12f4l9h4/34431002067.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e8091db86806b8c202a36bee0ca3564e/gegeroxoripetud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+pray+for+financial+miracle
    • 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_off0000fd89.bin
ba8b098ba1e81adb154a8c8538660f765591746891b973028e87fa7ef4bdc65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10664 bytes
font_01_sfnt_off000115fa.bin
129a988a4134eec8037e3cdea621702d3fe39f7c73ddd3fe2756d96301a456fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 17124 bytes
font_02_sfnt_off0001428f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes

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