Malicious PDF — malware analysis report

Static analysis result for SHA-256 159e52d91e45ef12…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 11:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0b2703d64da4e48e01ca1f3fad362b4 SHA-1: 49326feb605c6087a84ad132d58340df71f3b500 SHA-256: 159e52d91e45ef120e57fb3da87dea7b56a090bb7ee56d2e9abb875e4a4d5021
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection suggest a phishing or malware distribution attempt, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1785

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.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f273321e6---walulomokomefotuto.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8jv7r9k5gj0bipsb6imktvb5ha/39025311567.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb015b163---4547240394.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/xejogikijuxolelaj.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/86586796950.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/acbd2eaff7d1248eeb74a3bf33702efa/kupomosarumupozabi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mifominuzusivepodulevop.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/dixijonokobidedizowaxoda.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6d8396b2---26162399363.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/16235856446.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbfd4c9b6---10703005215.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a1ec9cf3d749e1edec60670fb649c977/23107192483.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075969a0fdea---tifik.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/zapij.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9226b7f2f102ec133322e16bca7b72cf/21625558477.pdfIn PDF document text
    • http://nadamasristorante.it/file/fototot.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607844b329262---2128491028.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xasilitobadafexepad.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/natikuwifajotimitudi.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/bavemebo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f28821f5a1b6473e7ba2bc815750a4d6/pikalodokilen.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/venulufufabopu.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/57847257974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+the+word+concomitantPDF link annotation
    • 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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10788 bytes
SHA-256: cd37d5a54ad9c29fb67950eeaffdb97f38f6068148afcae0286f1260984fa001
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 16932 bytes
SHA-256: 930d86f7b8d7b72bfaa7f76b37e0bf196491aeca480186045a844c1fc949ec94

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