Malicious PDF — malware analysis report

Static analysis result for SHA-256 29df61be3bec416f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 03:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0623b460b2404641a7c360954b45076 SHA-1: a183bb74225db567ad1ad23d4997eaf601d9b340 SHA-256: 29df61be3bec416f16cad10f9268294bf8921933fcb653bca7053c0147ad74d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with many URLs hosted on compromised CMS upload directories or disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://kondicionery-dolgoprudny.ru/upload_picture/file/juxogazijojikete.pdf
    • https://tadimtursu.com/image/files/12248837971.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b523545c2a---penimizojasaxafipu.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfad3f410a---81016445236.pdf
    • http://poexali.org/static/image/_u/system/files/vawemugazemasa.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2ec517e316f62dbc8519120f5c2c8939/liwidemubis.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88a9593b0---92368748084.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb279e83aa---sedux.pdf
    • http://studiomuraca.eu/userfiles/files/xowagadopelokimupiwat.pdf
    • http://solo-reisen.com/media/images/file/wolojepitasev.pdf
    • http://gordostcrista.ru/userfiles/file/79317805530.pdf
    • http://greenmodels.ru/uploads/files/gesisexanawabupavopula.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210925_122253.pdf
    • https://marosme.ro/hirek/file/18304738228.pdf
    • http://sziazsauto.com/uploads/files/futedazuvutakim.pdf
    • http://info56.ru/userfiles/file/segixonosonexujefoga.pdf
    • http://christ-china.com/filespath/files/20210921122803.pdf
    • http://cdmatik.com/uploads/file/20722998963.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7j0da48m1jcv6e329glnio6tqu/14809825139.pdf
    • http://mt-filtration.com/uploaded/file/2363309686134619549138.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa219c1d96---7294459736.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/lajij.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/fexetetomamakikizaziromit.pdf
    • https://gmnavarra.es/ckeditor/files/ziwomuwusorixomusukapemaf.pdf
    • http://mawratanews.com/armedia/uploads/files/71475387706.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/puwafowu.pdf
    • https://alperbehang.nl/userfiles/file/tesejolewumapinibamu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=adobe+photoshop+cs3+serial+number+activation+code+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b700.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 16792 bytes
font_01_sfnt_off0000cf12.bin
cb2b42f9b57377236d5f129a8b1b55bfb814aa50d1835fa1b6fa31953577cdf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 14264 bytes
font_02_sfnt_off0000f2fe.bin
bd67735f2972dd6f91ab86bc58c870aebcb6e464f786b41c0500d3cfa94861e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 11428 bytes