Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f675c625ba8a01…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 05:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 645cbb11317c0666338b30b14a9a76d3 SHA-1: 9dd1c6d49f16b4dd546fdff6826100c6f35a5fd3 SHA-256: e3f675c625ba8a010c5ead5760bf9587ba137d309822008c9627d771a8b1e1c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=technics+1200+mk5g+manual PDF link annotation
    • http://ressourcengarten.de/azubi/userfiles/files/27812176037.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/sarofexixusozovore.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e486949ff70---bajakiwexasurufivofoj.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/27476246709.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/bivezawefizirakaf.pdfIn PDF document text
    • http://bakoca.hu/files/file/zakebej.pdfIn PDF document text
    • http://rayanchem.com/d/files/wobuxagem.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083743f39249---54070594210.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4de30d68b3e33de06cf5f270edb525d0/15197277082.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bf995a46724735bce223f954ac63efa/72225888381.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c574f4a6e20c26765dbb4cb793569135/55268405369.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/14023787318.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/52637080859.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/lekemegobevi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da60fd85b6---85550265097.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/22188883871.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/8386562070.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210629160626.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/88614152980.pdfIn PDF document text
    • https://puppometalli.eu/file/25156027333.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9323796be---48363602534.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ae9f5agigotu3kqivkeldddf0m/fazesobawoxivito.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6f44f72561fc392e5c0e129d63a4453d/xilizapuzinatuta.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10940 bytes
SHA-256: 4f0205ccca4928aeee167d726a572743c56146df55a0bc28cc522fc08af33b38
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 18128 bytes
SHA-256: 82e922f2d96299da6fd2dd4867acc5e7c8cbfd2ae5c52e7c8ee653bb34a20ebc
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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