Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cccf25d640f8420…

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 09:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33b6b4c3501a7edd76ca3e336a249571 SHA-1: 5248afdefb312ca7f7335120e517acabe8926c16 SHA-256: 6cccf25d640f8420d6b61f12a1ca411a8b3bc729aefaeb04cf82e14fa25febb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda3962390---kitijoseropeb.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/72885194551.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7fsnmelk60j53tdjsgr3atu0nv/54698733842.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/advnsj9v3utqmcb9njvk6iilti/dovek.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/galalozudataruje.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jezujomunej.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/41475117481.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ee7dfa1a8d4c994d9f6dea48aee898a7/mibokapoxomuzujiborufab.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4d160b23192f9a741e6e85c783fbea2a/23485001265.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kavq5no61uj76t1k0lj8ui98m8/88980653339.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/joxuxijujomemabusekumuf.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8471ecb49c8e77413dbb9a049aec57c5/fixawivageregupun.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/8388930066094bb51cd088.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624713895.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/928ca10d6558643f58ba26643b3d73bf/gobilowudenelenipuvote.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/kuliselatorifeva.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/27295231696.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/20740094783.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6ac58714448009d77d7aee8018e17cc5/godideburadadopukevixinam.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2b140e504---gijetenemire.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a6fa248b---lukagakodibaju.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5cc8c8f4ba1f148aaf527aa06ea17332/75763990554.pdfIn PDF document text
    • http://yuhongzg.com/d/files/25894373315.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/18189788759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+pohPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 17960 bytes
SHA-256: 7f26788d18f0b39edf4b898e5c1e8d911937d3bab346cee7954035828ceb3928
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 16360 bytes
SHA-256: 2532ac0d4b3909309c06b2334fc1939d015379d6526dce6455f7e9d00e953576
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 9980 bytes
SHA-256: 820cee804541861abd3b83e846c91a89998081747213e45cd8e0df0c4adbd94c
font_03_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9F 2492 bytes
SHA-256: 412284fc0cb9738cee4c88ac134fb17417f2d978fda56b87b404fc0eb8063fe6

Open this report in the interactive analyzer, or submit your own file for analysis.