Malicious PDF — malware analysis report

Static analysis result for SHA-256 c958ab0d7743e1cf…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 11:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17fe9903bd1a4ca03e67f015da20245f SHA-1: 019543f6cfe29842423ec04ef4436af9278f6e4d SHA-256: c958ab0d7743e1cfcf8f65952d601c58b8c0e52f0b4707af328810ac83b396b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous compromised websites and disposable hosting, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious content, potentially exploiting PDF vulnerabilities or leading to further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ms01bet.com/contents//files/8991896571.pdf In PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/3759952764.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/r7cbgkqf51aedeck82nrgng58a/kilaripatiw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609536551d016---90544419250.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/80486617270.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f976844de168b70f4ea135e371a56ebc/1862846516.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/22940584688.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e673279f---72566623299.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/dezidojuwezagomamu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/795780de8d4b943af273554dd936825a/jasudejelovulapivubosuvas.pdfIn PDF document text
    • http://classtool.info/upload/files/furozafusojikodewa.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/5559565050.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/53025462517.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/4351591903.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/53491952593.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/0jvbv1s5cvc44cvfocfri78nc0/28952559090.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/siladomuzigexonulimezope.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4c55ae69---nawefon.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c596e88f298---movuforevanevejitixapan.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/86975487317.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051319300073499.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df717f3ada---37576794474.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfda3c1017---karovi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/21709179575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=quality+assurance+in+clinical+chemistry+laboratory+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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 11296 bytes
SHA-256: 852fcd88875951a8b3abe3742e4d76deb8d5c440bb84ad43ddaf9fd7434d913d
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16640 bytes
SHA-256: e6433dfa6aad6ea43e023031a0bc6b20bdd0d471da69c9362c02101a467fdcfe
font_02_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1