Malicious PDF — malware analysis report

Static analysis result for SHA-256 2768ce5578db7573…

MALICIOUS

PDF

86.1 KB Created: 2021-07-28 02:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28236ce50d74376a7da5be2ee86955c6 SHA-1: 1e06e05fa92b317941ec6ea5c1f32158bdabe736 SHA-256: 2768ce5578db7573631d0efed602e30363b44c2213321e6582d59863ceea93b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links, many hosted on compromised WordPress sites, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b578e4b51a18e024737a74ca8b666173/danusomuzagenulijopoke.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e94140fc---36481830336.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4aea242a680b6d15a9a04a000ba4964b/tugivapodaduxoxipuna.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/028f894f191b10f2854913d97de05437/91676198096.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec7dd7663---21439861293.pdfIn PDF document text
    • http://bienbao.org/uploads/files/sevitibelapu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/46179598655.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/roriburirunavomujabimane.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zanawipofisatudebun.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o5qequ5jnhccu547g09j6c045v/90452545224.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e762daea2c8b6d3934d1e85ae9a56452/59118397593.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/35845550307.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f3dc76b587362e183c55646196c6801a/54766106267.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nibanonij.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210606181306_e4lx2r.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b490ca6e3---98334529997.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b5a13bc---wijuradusizopinoz.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/a5be0ee9a777019d9370c28834028c71/widatosiwodetusago.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/28154529261.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/02d909c2262c6983cd9349c129939592/naragel.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/vidapetupujerifekokuliru.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fukij.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c48651d7964---86473074931.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5940bbec6c---51874044014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+a+man+make+money+on+onlyfansPDF 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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10320 bytes
SHA-256: 6fc85a45d4bdb3ffa9b94890536b478f43d22fcd25104e0dfb3338d3e499e195
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 17056 bytes
SHA-256: 1c057388d1867d09e235c835995fe205a058797211fcd5430baae726eec8c83e