Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01c1e68e26206b8…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 07:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b8cda2c8f6422fac4f7d6c09481abc5 SHA-1: 28269d38c1d3a3d6c2015e29008dd040206125c4 SHA-256: c01c1e68e26206b8d7129cc4c0899036216fe7ec86ba1c08f72c1b8743ab96ca
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of these links and the detection scores strongly indicate a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607b145604bf6---basewunako.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abddf0585---30212734301.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626002148951197.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/10814432229.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4937443f7e---29385643367.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502110625608842.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/74838496171.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a42a13185782f96dabeb3bf701515bea/6272558673.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iocli551hqp4sjeddh53865o12/42768150244.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fea1c87fe3---mubikekirukaronido.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0766141c7---jedefuvugiwuwejugedofu.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/paxafawiburanix.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ffbb6145f7333293bb2e16697e08fd37/faluvewovar.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36a8dfedc---fewodufarap.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/95277641822.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/pubaximerij.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/soxebog.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ck1g2in787mq9kpsd7tt9el3ml/tofezadabama.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8237ef0e2---galelo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c309d101e---zosagakawowu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/dabasezi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b4f43625f03965894a3f91e2ced207e8/molobinofipoduzudaj.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9ab72d380312a6c8ad31047335fc6ffb/76283900921.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2oj14v9bp5l5119impocd9he22/vunavijotusovujadur.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/82b2f2c36238f41209d7f65cef8bfcdf/30612972884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=should+knees+go+past+toes+in+squatPDF 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_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10984 bytes
SHA-256: 8bfc611885338720d49754d5a0b588a9d6a57b63bfb3a81c7a9bcdc40be4cb85
font_01_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16736 bytes
SHA-256: d59c9a586740c71697d8cef7b7ace736dac4228c9265c548e3b8ccd458655994
font_02_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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