Malicious PDF — malware analysis report

Static analysis result for SHA-256 392b2e248723f716…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 06:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ace1eaef573bcdca1627aa52656781a SHA-1: f16f07201df269462651b216448a1c816338a68e SHA-256: 392b2e248723f7164f6a9ae1cbb2c04f2ea66e8a6ba588fb010b775fc937108c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ed801e6d---pipitoraboweg.pdf In PDF document text
    • https://my-natural-style.net/upload/files/muzag.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/tevumesugisuvovuse.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/32199614427.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/marulexudimepomojo.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/kivijiwixujo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/rokibitidopatagujarekevol.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3e62a030d4a567c963a735377cbc021/kesiwamore.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/52369550220.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8f8e7e9d6eefb7969bf01d755fccd9b8/rinimege.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c80893307---borafivisufibilepewefutu.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/minofivugafoladepowovur.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/985b7f13399b1d7fa7cfe4d90b56d965/bitako.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pexegivokokagezizuruj.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b675b735---93387268492.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96910537391.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e310a2b175---getuwalerevozekabipe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/decbc31b6dece551f90b965a43d1bcb8/1518884378.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f6c6414f72e740ec3d04423fb786f035/falexabonovotebuv.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/220740344779.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95e033eaa---9190255383.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/71267900207.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58dbfbe6---kejarotamubijuxopiwotupuv.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/jewukulirunukam.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1b4ffa795b586e56c825de6a85a8b459/vovuzojijotamaxax.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/dosuranodilojipodedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+pumpkin+into+a+carved+pumpkin+in+minecraftPDF 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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 18548 bytes
SHA-256: 4a5107707a8a03610910d5270d981640a03f91addee85496ceb2b21e9f1cedd1
font_01_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 10900 bytes
SHA-256: cf614f00d68f05856b6f1809b662f3e8503355a1c4dc7a2b09169c7287be90d0

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