Malicious PDF — malware analysis report

Static analysis result for SHA-256 791f41ca58acdacb…

MALICIOUS

PDF

92.6 KB Created: 2021-07-31 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74e78225e99ab3697355f4bb0229d2ab SHA-1: 485a25bfcc204b9d61683da3106d3d470b3594e3 SHA-256: 791f41ca58acdacbd9aeb4382d2e8106b9a06129aa8d5278fef9328ac7db443a
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded links, several of which point to IP addresses or compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://loadcell.vn/Images_upload/files/10016681588.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/10d6d6f38b744215e4502aa75e8c2d6f/74030441186.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mizotobilokuz.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced66cc32a0---35733729197.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c447588c52---supujaziko.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/banexinijegadarumizizan.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nojebanosukaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/63824846807.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107090716523683.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ojssrcjf8bqnmshsetdj9gr5p4/xuwijogig.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vatezi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6fbb303---47478549852.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nuwujawowamubujujutegafem.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/glr4c4bobcf1l4gu8b19qbdak8/13315380237.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/23079262420.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tamopopejoritabi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/9c76c3110daa358bbc601d041e582440/29967224208.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/rs9le291m0fd57i1jrde3k85ho/gewezuxifirurir.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/90f807d29e5aed5d34b9de8bf2f6680e/70294210022.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/70972485322.pdfPDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e2f9b0f6---dabidamogiwonir.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9ebqtq1uj9gas0mvelqng2vjdl/xosiwurisa.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/gopibimakobuzekulokuvo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/351002f888e5d7850b30b0eefae10577/lanakasawujunakaxunixin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=afasia+de+conduccion+caso+clinicoPDF 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_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 10352 bytes
SHA-256: 4c798cb70f9fade6ba234787d807f9e851da100240eb340f422e6c26557886fa
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 17992 bytes
SHA-256: 1a6194318da82057265483d935c7387a848691884894d6036f20f73752a7f3b5
font_02_sfnt_off00014a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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