Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73dab9a4d9e7fb…

MALICIOUS

PDF

101.7 KB Created: 2021-09-08 03:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9541ad14a85465ea88cb791d6367c281 SHA-1: 37dae2c8a36ef7f22fc4c0070d0e38d541d80381 SHA-256: 0c73dab9a4d9e7fb670820091bf8b4d3f66f38a5bdc76e48cd7f487a1cbd50ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to potentially compromised or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://coaching-scolaire.net/userfiles/file/92055557155.pdf In PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/6984455013.pdfIn PDF document text
    • http://billsky.ee/files/file/88279994791.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/88253270308.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tobabezagumalijorodiwa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ec398215---potefamuzotubawotek.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vojowafodifobojiwil.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e805f5c5d0---luborupisamidejafidibufof.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bejesajesetezilasina.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea6164602---43846301992.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa896aa04---najalutotopufole.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vewufezovog.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/digusokipego.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/22104891264.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • https://lecapsuledigian.it/file/50182297635.pdfIn PDF document text
    • http://c-six.it/userfiles/files/86499470806.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u80ork3evheo0mte5dtq09m2gr/80430173046.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/48126159398.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/85516006802.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cefce4d3db55054bedefc5113f04d306/wijupubuxurupovofi.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/96890879034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=idiosyncratic+momentum+u.s.+and+international+evidence+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_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 11076 bytes
SHA-256: 7d6085a8b9c830ae7c4b2d291e8413ba1407a96538eea75e59ffd1e7fe8e1819
font_01_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 19156 bytes
SHA-256: 90c747276800229fbc09960c80e8f7d2c14a828c92584a7a33d7b91d81263c3c
font_02_sfnt_off00017081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.