Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c573e3f0c98f209…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 11:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a58f6869b3bf5ccf1c0489852b102333 SHA-1: 14a406436874a4ad0e0c49a40b2476fd1a94b83a SHA-256: 3c573e3f0c98f209094e003bf6fcebca59e5ad7eb48230fb2b19f285361ea11a
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. It contains numerous links, many pointing to potentially compromised websites, and one URL specifically mentions downloading a game. The document body is heavily obfuscated, but the presence of external URIs and link farms suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdf In PDF document text
    • http://sovaimm.it/userfiles/files/8749493886.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/leterowenolufesulibovaxu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/tudawetuzejevakov.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/mobodapiwim.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/84043542289.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c696e3d41---93213914780.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/sosoxebofubuzeguwasefu.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/17667939081.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210917020934.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/68fcf19510af028b944323ad563dab9f/gibikevugonotidekapubaji.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_100822.pdfIn PDF document text
    • http://szjg.hu/images/file/xuxugatuteniwepofuzewizo.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/64166801089.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/9693767684.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/zubosokakudoxofovim.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedc97a7fe---naluputagaf.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/46902014263.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/sosejenomewarosepi.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/wulavuguzijozalava.pdfIn PDF document text
    • https://digireg.sk/upload/92474243432.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gewobevitusisuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+gta+san+andreas+android+torrentPDF 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 10508 bytes
SHA-256: 1c488bd3513d723e5962937d891a85f087a38857ed2566027ee2fc46a98ec7a7
font_02_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16804 bytes
SHA-256: 76d4dd414776d659fde9581bc9ff198851e99673aec79ff8fdd0a07e8b3f8b06