Malicious PDF — malware analysis report

Static analysis result for SHA-256 4122cc60796cf88e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 03:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d5b4c140966b7806e29c2f27eb9553 SHA-1: 8eedd2eda658234cb6026dbf117b5f20aaff4a0d SHA-256: 4122cc60796cf88e853f68279868c5611e0a54791898feb859391861603ccb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various PDF documents hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed as a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=harry+potter+deathly+hallows+part+2+book+pdf PDF link annotation
    • http://eko-baby.ru/userfiles/file/63467982510.pdfIn PDF document text
    • http://annabarons.lv/files/files/82305683506.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulixilizarorafi.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/16302903135.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/kuvigipexetaxepukejopolul.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/pinamukenojizokopiwev.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/56948543111.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6af36427---79217601978.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sawiliniwob.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904002019.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/vexafufin.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613625364f625---54666970872.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/balogugogobakovef.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f95d2fc6b48c56d8d839994950774e5/47854273121.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/5661440520.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16137bef262e01---bewagozoxelesigazu.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/24200781719.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/panujig.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d668d3b607---33709600326.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/26855491243.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/12151780342.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_2D760606679ADBE2.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/gomapujetebuk.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/148f468c8ea8e16a51e33fa6de069dfa/88701030013.pdfIn PDF document text
    • 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10940 bytes
SHA-256: 13217713995ff03006f96379f393656f1802ddeaa52d6008d8c167fbecfe4475
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17028 bytes
SHA-256: c29b3e5fefbaaa03bf121103a75a9e3139a4437e8088f409cf21141d86b8b5d9

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