Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd5cc6b0f70941f…

MALICIOUS

PDF

97.8 KB Created: 2021-07-26 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 50d30aac68f77da3f182761e3de39c28 SHA-1: 1a9f55d9e12dc9f6e1ee2c44e7d83208c3bd2c7c SHA-256: 3bd5cc6b0f70941fa21ef6f50edaf7a7be7453107be1c671060bd659a58702bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa86eabcd---33467319191.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3dccdd9eb57310b0200ee7bb6ff7098/porasejetobebapidira.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6ba5084a---97436349360.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfabeb43598---46661010122.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/22755912638.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/83247248235.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd5ec5d28a---3882804009.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/jigesiwojisotuvevow.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nudutapasixojesagukuge.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/somaxesabuxi.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/46420538029.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/229286df7d73f47902637dfc30af6408/lusatomojadudiba.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/2217371740.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a3a751929ea1a5521aaa79c5053455a3/lijagajamumutem.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5cff49fd3---dijuvekofi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f3b614d4---99417530715.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8t1ots0ocmbi1dk0l29a4beqsm/26277443194.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5ms8p72ltltjmf7si3im638566/puwovule.pdfIn PDF document text
    • http://intergeored.com/upload/File/naguluriradakomezawak.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a5b6a9f6a63293bfdff5d0316ae05b41/17538129978.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/43249070361.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b638ddb0e884996ee36b7b2f7d26bfde/95245150573.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0246c6916b---xatumadanopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=republic+ez+drop+spreader+settingsPDF 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_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 17112 bytes
SHA-256: 2d0a5a6835c7d4866b9624f0ed32556291c4f111ef0d78645a25691bfe05dcfb
font_01_sfnt_off000146c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED7 11032 bytes
SHA-256: cdd96cfa0092c28efc08f391a3d1d1c10ea79c23e64b0bd6779c1365d61cb146

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