Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f224456e671e4e5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7d6b210d4aeeb75262675d1f296bcae SHA-1: 2dad53dc4869aec65c329654c64f101554e09d4b SHA-256: 1f224456e671e4e52db8d96d39bd7d6058e15c4f4b620f995c5faa749c2f93bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure itself likely contains embedded links or exploits to facilitate this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa10c691c---rigafomomuw.pdf In PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/29676580760.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/4571341889.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/p02rte4qsjop2v7ejad0s66c2j/vojesu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb9l53q026qoo1v6um656rpa/66565453810.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608284930c374---25524838516.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbe274e96---48592873050.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a908d2ddc9---tegudujaguvekuxuxusibo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3441afca3---41850691011.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8phahs3j0u9pbidckpfd3cue78/silipasulekagolewu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7f220bbfa---movujunodofij.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/13792321242.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/90025673952.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/remunowi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/40503672205.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katudiledaluxitibikigu.pdfIn PDF document text
    • http://islandpointfl.com/userimages/94412240494.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wenubenusom.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a1aed5f4---zokos.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xowedi.pdfIn PDF document text
    • http://strandedtattoo.com/file/76029154888.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c79ce8afc0d8d3e3b32edb5bdf63d183/muvuwojovunupinur.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0a18e75a---68056096758.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/60765808344.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/lofojukagafil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=comparing+decimals+free+printable+worksheetsPDF 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 17340 bytes
SHA-256: 3214493d94f3a9a44a0717b045cc558de3b28ee0ea1a470fdc794f1172b628d2
font_02_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 11416 bytes
SHA-256: fef0bad8325f2726879f696ea0a04a49a955fbf92af011a67d6ca3307e1fadeb

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