Malicious PDF — malware analysis report

Static analysis result for SHA-256 725bfdc58586c4c6…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 10:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1aab19f9349b20879ab916ca27aa2240 SHA-1: 78054a12a51ea9c840b1b26a79418e240351cf4a SHA-256: 725bfdc58586c4c63aeab9fb0c563f90651af18bb16deb90a8478a2abb29509a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=gta+5+visa+2+apk', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/uplcv?utm_term=gta+5+visa+2+apk PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/da43f3e1c25dab5fe6ddc8478b7655a1/kujujufakeg.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/32382849397.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/22055001899.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kegazikofozudimitur.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/79098463271.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/45225301280.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/zivupotebiwomitolovame.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8keoevfhqhcq335g7cb3m89n32/85953213096.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/zurebefuwa.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210918_86B833CCF08D2B0B.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b754247ed8---74901175955.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/46296836563.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/89709825683.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/pikuxafejezukepexovid.pdfIn PDF document text
    • https://777mto.com/contents/files/13889513249.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/66986174384.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/rapuwadalotalapajunop.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/pevuzutowunukip.pdfIn PDF document text
    • http://knipia.com/userfiles/file/segulibegulipagiseso.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/zilijifef.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/wagumex.pdfIn PDF document text
    • http://mastervin.ru/files/file/1812268560.pdfIn PDF document text
    • http://contelex.it/userfiles/files/sizadupod.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_off0000ad77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 15308 bytes
SHA-256: 0a2e9ca43c6c1aec3db40497c06bb29f93c4d1d0da2e1d5b91701bb66fa76d0d
font_02_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10196 bytes
SHA-256: 8abad8099e07e7e9722ba4e34d495ccc6988aa48e55361be5bac4df9ea74f777