Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b6d2d39543003…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ec876225d5c339a12e88e4061823b97 SHA-1: 6dfc4721b07891e58ec26b910dae616bbfedaf57 SHA-256: 8f7b6d2d395430039e5fadb08f10b71a109b85cd9b944cdcd0eee74cad84052e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=17+irrefutable+laws+of+leadership+pdf', are likely used to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=17+irrefutable+laws+of+leadership+pdf PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614093a08d88c---12447836893.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4t9it2njoljp1u3rv5snavg7e6/7038601870.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/96412470310.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/55008781201.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zekoverezowoxig.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673fa66351---lalemav.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a1d0da19---15806241548.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/vuxuguravufolopovojopeve.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/23258780521.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/73623491591.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • http://ubest.ru/images/file/73852337864.pdfIn PDF document text
    • http://spakimthi.com/upload/files/xodes.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/dufuzatikositolu.pdfIn PDF document text
    • https://best-label.com/upload/files/ridatepivi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3203d3a163cf019f778568eb52b73ab6/45674343230.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c108bd154beff076d4629126058a40b4/73999943905.pdfIn PDF document text
    • https://pratham.one/file/56293703732.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xinazuzasatefofazusiremu.pdfIn PDF document text
    • https://polaria.cz/images/file/59710826389.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/lfht2ogdmj1oau54kckoc37rib/95020194028.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b76153a3e7fb43e7874227dd742b5090/petogavefuja.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ecb3e58e96ed930c756b4144ac40407b/33818311829.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/62884475303.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8360fefecd86b8954c1181fd5b9b66f3/bibupojuzizodofipididegep.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_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 10820 bytes
SHA-256: 41b77bfe622eadfa506a4e1b733ea368d7c50ae547bac154e58ac6be8e22ef12
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 17284 bytes
SHA-256: 65b020ec1df03738dfe44a3327a0940fdb5af6fea3af8fc65d2badb154eea26d
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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