Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c231a2304b282a…

MALICIOUS

PDF

81.6 KB Created: 2021-07-21 04:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8396e78636ad9c6e690a28ad8f5090e SHA-1: 9d5c143e7bd7fd4fa1a52aa8adc4741df4b9fae2 SHA-256: 98c231a2304b282aeb34966cdb03c020d0626dba24dd14cbc9efb72bef296535
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It functions as a link farm, containing numerous URLs that point to websites, many of which appear to be hosted on compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7de70331---gumubas.pdf
    • http://ufnk.fr/app/webroot/files/file/79864439759.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2c674afc---doxazewogirak.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/adcnoa55tatn55bbo56pkdhs05/3512547218.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7ebf3065---60308981708.pdf
    • https://gmnavarra.es/ckeditor/files/xuradebavilusalunisiridit.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7f56952035df683fb7d14f02a35cc09d/pulelowen.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f760f2614cb---lugokarebunivumiredizom.pdf
    • http://rajskiewakacje.pl/userfiles/file/99729496701.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/wumipagiteritukum.pdf
    • https://immobilgold.com/file/64804998483.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea6419f8e---51625361544.pdf
    • http://alfavs.eu/userfiles/file/33148666792.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b9f6ea12178adec0ec9c900b49312e75/wikerokemixesoxow.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e268482850b---xudarabunojukufese.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fe1489db---xusonaguwuzenuwaz.pdf
    • https://bamfieldrental.com/userfiles/file/kulazefukobogol.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b3f24de32a5370c78de4e9f75232225a/givalewodufajozadadinoduj.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/pn38n79c5aqtr22skibamq37hh/25626955216.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4a2nu846mpo73qgmbd3ap1kkk6/sixeviva.pdf
    • http://thaoduocvn.com/userfiles/image/file/sesirilusomujarefitotibi.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48883f9f3---xinasiximomudurujovi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834753b1415---55476117693.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de0cc0eedfc---vozor.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/15842031897.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=take+off+from
    • 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_off0000d73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 16792 bytes
font_01_sfnt_off0000ef50.bin
bbccf1e009f15dadb1fd44eea0b6b8ad402966a38c10d53781e10f6b925cf0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 9924 bytes
font_02_sfnt_off00010545.bin
281db554f47b4cf5d18c3b2444f46ddcc56bcb4b8aaf19127a74167d62c209d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 19636 bytes

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