Malicious PDF — malware analysis report

Static analysis result for SHA-256 7150ee53665633db…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 11:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d6463e3b5a0b1511836ab97d4040f3e SHA-1: 6f98ab543b6eebceebae6eb6e8804e0df49ceed0 SHA-256: 7150ee53665633db68dd8776a338f19957279037bccda8491d31c3d789642e7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not directly analyzed here, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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=project+quality+and+risk+management+pdf PDF link annotation
    • https://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9811092672.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/nenavavutevax.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/mogefikemoxemadosozevad.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ief2i2p7vaoht9ejuluq69h20i/70066649321.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607688744e006---dewumurup.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/zolabanevemovukejoluriwa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffe7cbe814---9524931955.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/5381894931.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/12958406142.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/remusini.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d90mo8dqm0skj5q053j70ig3nv/50278501953.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/69184842551.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/napobelotejalilezekowobil.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/40509459615.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927acf4d7f3---xulinovuxiruduxujupuvijaj.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4f7ccdc0---32421024815.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/wisexasisupasogi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c2e74b8ce23bdadbc9d768f43ae98528/doruxerefevaf.pdfIn PDF document text
    • http://zuche0551.com/upload/file/96502000364.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084405f29beb---lisukegevuxuduje.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/giwupemivegemunenu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/452612f13197ebf82854b77dcaeeb55e/64341939648.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/79110137378.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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 11544 bytes
SHA-256: 2b079ca539450f2a4eaf84f64ae44528ec32ead664477603ba750da29d38f452
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16496 bytes
SHA-256: 0d20fd1a13c186890d50073b600fe81bac8b3914da870c3c92182e64bdbe48eb