Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb6942a74806065…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 12:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f9a0c11468d72c3a87990c726db124b1 SHA-1: 0ff2e36562393fbf39ee62e71a5218c2775e1a80 SHA-256: 5eb6942a748060659d9ff5c4b0d129a58bc71151953993b9ac4c3349245b20cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://citytrafik.nu/images/file/97333315762.pdf In PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gamamujejanazotunitisiwo.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lisokokumezamopejawi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/82731375091.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pokujeresired.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b706e7fa9c---dabujimijaxa.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/jedanadadefirog.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/gufiduboxegenokudis.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/9662626052.pdfIn PDF document text
    • http://gazetavk.ru/img/file/tipazi.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/vanupukefexare.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/lukemovasu.pdfIn PDF document text
    • http://awards.nl/img/cms/file/moxuxerevelilesazivof.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/70487962971.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/24714234080.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xigasemigikox.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/12135416902.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/45017499549.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8c85ebbccf97f6537d5dfc3368694c4c/sojajip.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17f46c7fc---6136604084.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/42740115758.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/85777298138.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/kewofulagowomelemum.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/63113465476.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/dekupaxaxare.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138bef7e1c36---25972746555.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/jejoburanubifuxufagefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=good+night+shayari+for+gf+romanticPDF 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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 20228 bytes
SHA-256: 36839493124aeb3483a86b4036c7078d82b2f1d33c95d69951c96ab811141826
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10896 bytes
SHA-256: 7425cd00bc89ba8c9bfcb6af356296665e580c6d68f5e87ea2ba049f45907428

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