Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b7ca31ee164cde…

MALICIOUS

PDF

110.0 KB Created: 2021-09-05 11:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4175886f3f7a42e17a54d193b98fc003 SHA-1: b95d0a2c0ea1dbf7356268e434b4161e0963f581 SHA-256: 39b7ca31ee164cdea154a666dbb536525ccadc1779d10af3c486486555a8e408
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm nature are consistent with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://zsmnowakowski.pl/userfiles/file/melefoxe.pdf In PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/54486277724.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kazavafogituvaro.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/22014413239.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8tajdiodcqbl132o838jafbtm5/94905355520.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/875be15c96de4e22fda2e8f1beebe82d/toregemez.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4ff46687622a75105a8a18e26ff0277b/dapafa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/blif8mj5gdad5io61b2a69v0b6/bumimosudezuvipu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cec4d907b---topeteloxipevonebadaz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zakufojevusirogopuvuvut.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6c191297e0514d460a6779950ed0723e/62057762295.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/39ab6bbffb6ce040a00f2c9d64c1f474/14932563537.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/92905587393.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/47267287732.pdfIn PDF document text
    • http://blugarden.eu/file/89273440615.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/66910005310.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/lukabo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/uua5iese84cn67mqr87jfg5k7i/11417522228.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f9fc027819ce23c432ee8b20dd5d0251/47173784073.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085959e4be18---17080818130.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eb8a31d79---44572563047.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/1922757863.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/68575000622.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760ccf70235---nozav.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/35849980866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=panasonic+fz2500+manual+downloadPDF 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_off0001454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454F 18824 bytes
SHA-256: 5b5085a3de1643756b9d64fc307a21966cb53ab69e61b9180533f9ab8d681120
font_01_sfnt_off000176ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC3 10928 bytes
SHA-256: 09e1a2a869a9284a5defc01228884709256946c233ad434a0e891a295b968adc

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