Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a869594244ecaab…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 05:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b7ec9eca1bd432f1423fbeba4879b6c SHA-1: 253dd82bf23d4c412c89326353e452cc4b04f552 SHA-256: 9a869594244ecaabda547bc2187eef2b0f047332ed699763c23e5ceab96fe3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://media-get.ru/userfiles/files/jimefiz.pdf In PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/56703701173.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161177877b0a08---nozinu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0de04ae7---52508521229.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3knn66gcjr4tgoia6l71vjviv7/83469069185.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/936c5e660604ac78f1e91e724b48eed4/fijonuvedetasipililazalet.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/86354684937.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6dd8a85a---bizirajibekukileju.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/47861220314.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ftbjl358tnarv0u199nt1i1ls8/81832364243.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24955406244.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9f96e791---vaverejebitebiganunaxidos.pdfIn PDF document text
    • http://hanleyresources.com/images/7602452198.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd2199cd06---dupewibogi.pdfIn PDF document text
    • http://newmob.it/userfiles/files/vufap.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tsc9ap19l5nu7vqfsf6tva6vb/58168891669.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082be1d60f18---62706184740.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nuq7f62e8qe8u7elskb94lq4n6/judugasekukix.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b26b19f8c---13380071781.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/38863150845.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/moraluxalesovogibonox.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f85785da5---684944944.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/dawavubalekenetagomowevun.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/zixusidesugezovazob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=starch+phosphorylase+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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 15952 bytes
SHA-256: 2a07a0592715224cd5e0ef2a5a3655eafd165155925c06c832f7cadabd6602b4
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10712 bytes
SHA-256: 4eb0fce15e2ffef7f7f08b94ec32f893dfdda7bdaebb7b9cf6b5d6feeb5c0b0a
font_02_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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