Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babf3f4f5f889ef…

MALICIOUS

PDF

93.0 KB Created: 2021-09-05 20:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54c05d42ebcba1cb75b6bf87656b4117 SHA-1: 70ac1b055da0da5db2e90d4f32b8a194d767af17 SHA-256: 8babf3f4f5f889ef388993561268bacd289d28bb0a6d70c60ec999af6735658d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://5udua.com/contents//files/51510812464.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6212f81836e567f1f2346fb0b6e75b8/mawutezejubavavujujozuzo.pdfIn PDF document text
    • http://liyangah.com/Upload/file/86300779692.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e1cebb6ed07b540aff34c45226d0cba3/namal.pdfIn PDF document text
    • http://pasted-radio.de/web/files/nafomumeluduv.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/84801832145.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/gifirurikulazor.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c11d13e4---xosomigupikid.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/97902290281.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2b680ff5e---gikovuvozonilutuniji.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/67820358733.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/zigazevimixo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837c4b5f6f---54331497308.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/penitevupokepepu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05679b8c0b5e86f388adc2d023ee68d9/vokipepi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb4dc51535---fobezalozigitivoxamorefi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e5737f1da8ca3460f78168ad1594ecad/38009085788.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ec017d63e25b0cb17b1e2160fed1292/46288205535.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/56417918557.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f256de9---kodubub.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0453a4930e---ginowulinal.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/61161161930.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad901e2d566---45628948857.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e1f74059fd8a8af5187b3a04f91e337/11631698168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=marxismo+ortodoxo+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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10472 bytes
SHA-256: 721886d4f3eccc5b24480814caec2340ffc891ac3f90e4bed55fac6f6b16979c
font_02_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 19024 bytes
SHA-256: 1531303b09362476f00636ce1dfd3dde652c8735d031be543646bfaf8be35114

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