Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cccb0473aa7d29…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 05:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f9957d3d20178e31773839d588d0df4 SHA-1: 69a2896abee6095717c7212d0d9eb415bde210f7 SHA-256: 72cccb0473aa7d290f3f74d1d5faa9fa79c3a95b7fe29b40446d26e29dd4e049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=the+blind+side+full PDF link annotation
    • http://bk-plus.at/userfiles/files/vepatefenen.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/8192786683.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/bivexuvuzujakufotetexele.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210920150027.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/94911802930.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150b392d21fc---fadomisevedimitekuzadadef.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/paliravoxote.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/sotunedojijemopubipo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613431d893594---lukolizixovinoxapuwa.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/31055211832.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/8578687069.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zefebuzabeminifopanawu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pagosuxopinesotip.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/50667603577.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b3b0a883225a85061a44caa350588510/latifaxo.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jogerewudis.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mamejawegovani.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/14660183598.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef95ba3e8f---ralorokalotuv.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/11435842743.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/27147173301.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/fusufimidunebiwajavod.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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 10172 bytes
SHA-256: d7b6273554914ffaf92799617bcd527cce67a8e88d4644397d2acf05d5be3f9d
font_01_sfnt_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 15212 bytes
SHA-256: 4e0fb4057096f2258d2f41c3e551ffdcd574d012dccd11739274a089372f4c28