Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5ceb78afe8e265…

MALICIOUS

PDF

114.1 KB Created: 2021-07-29 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c187b309ff4dd66b8f28d32992a4f6b8 SHA-1: 804557016fdc5538643a4d4d8e2e14552f04d5d2 SHA-256: bf5ceb78afe8e26550a0cc7ff11f8ec95c3cf01f8455524b732adf68d60f3c21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8132dde1---tuboxukedeletibuguw.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ff9f0681b2d2cb8906336bdfcc68352/33441020191.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d2d7f458b7f2543b4566e10c751e98fb/fegaxikoridul.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/22cd1aae262f2019905872fac3c1f327/33849176597.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091359738d84---23384199285.pdfIn PDF document text
    • https://steammining.com/userfiles/file/weronokisulitejosumi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ed7eda88---duwiri.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/20038049672.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944cd8c942f---21523589934.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8c07a7764697d08e958b30f50116e633/86703084982.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/kenemipopul.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/165d2d793bfa45ec385938bdd56e1bf7/7975214791.pdfIn PDF document text
    • http://i-dron.cz/data/file/vimijixoguf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/if3ejm4flgfu5juplm529qgjt7/90674535747.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8fe0a1df---devetozefusolikig.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jupl05clfus3ouh7i2gpnhrskm/28470480435.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021072819484573499.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa00aeb5bb---34484693456.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af81c41f04---pusemubizit.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/fezivufovuleledoxu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfa696f65---1741415377.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fsbdj5pepvfdmf0kp1n83rlmi5/32678330555.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/79336234199.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73bd746d9---mominofe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/85592bb26ca6b72e8a4076f8cfef15be/85894610033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=average+salary+of+cfa+level+1+in+canadaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 2252 bytes
SHA-256: f6a9165ff81fcac992ebfa574775dc691d9a294a62bbcabde252cb460826c8af
font_01_sfnt_off000159e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 10768 bytes
SHA-256: cef924dfe71e019c192b0317a1843a195db91a29741abae6592da091ff1ed8ef
font_02_sfnt_off000172a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A9 17952 bytes
SHA-256: 23e87951a3d81f9674a0fe76dfa0e5a21ddc986d5907920b0d6e00a03bedf5dd
font_03_sfnt_off0001a145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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