Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac85f48b82b9f8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22f7ddcb72618845290b9b4f3f2da142 SHA-1: 16a122ebfaeb911e6b83d58d08d33ebc0096d71a SHA-256: c3ac85f48b82b9f85ed53b9f2ef33ef10e88aa0906de8ad9967041e3b335700a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cupanghitam.com/contents/files/wazinufimovegulanivipe.pdf In PDF document text
    • http://penzionklara.cz/userfiles/file/fadenoku.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160733619681f6---14726760072.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/61100313444.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/39b455e3634bc51d1d5f975ef30b9216/51918139682.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89a959fbe117bdb009672be487f8bb1b/girupotimatexipogubovi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/86c14c0ea73d75aed8d0c4645fc6af20/93377958484.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/wajoz.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5b7e983d---11837562297.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/09b29ad78da1af754048e6a523ef6878/xotesonisamozaposivib.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/59873075365.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/lodawokekusapuwezuponewu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c7e815a2ee83c8076198d77ed66f4c1e/60994707665.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/sanefobusor.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/mozitidijizikutafolelamaz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e0c3c285---gimiserijinorurikutas.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/71029431168.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/pejaj.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cd44847ea51f7095322721e18422eeb0/30181773026.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/74265953972.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/77044437394.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/19818969451.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eccd2a61b---54815714214.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/27702701977.pdfIn PDF document text
    • http://staropolski.net/Upload/file/21567194539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=quick+guide+to+the+management+of+keratoconus+pdfPDF link annotation
    • 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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 11272 bytes
SHA-256: 556d0cc34a09436831c321f43f4f1939e5568a675ef247d193ec745a3f18c379
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 18104 bytes
SHA-256: 2c712644c98f17ec2e03f40d703e3f358b9a4caf236baf97c6bd555bab53b908

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