Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3bf021654d959d…

MALICIOUS

PDF

81.1 KB Created: 2021-06-25 12:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7faa3645d22015f0f7154d715da4275b SHA-1: 62231005761142b493aa78163ecdda1d1d06b743 SHA-256: 3e3bf021654d959dc48c043e801eb239b90f516edcd21213e33c79764a520c36
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8knkuuvuovia0mptil2k9j96cl/32846838514.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/cf220afc3ecd50e56dac2c7dc40c6e70/vemabowabejikiz.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ff698a54---fetanevorimuvapaxob.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9n0dr9le8md80o7704kar90691/guvomazapugifavoj.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eac6f89c0439a8c4dc0068e3477a66ae/90269036314.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f593220b4f---47357752040.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59e4b0f4e---33683520804.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720e72d9d1b---soxemagetokamagogunelebe.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/sudajot.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/misipelanutijaruroxefa.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/70181800883.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/musezalijiwigivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=motivational+small+thoughts+in+englishPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16752 bytes
SHA-256: ba656411c4a6958ff4f407f6023bd1544bfbcbaa704a64a6dd4388fcc274b165
font_01_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10616 bytes
SHA-256: 1c82d46bb48bd82e2463958a03cc938aee02f3015fb0319e5f8a9af4dc09023d
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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