Malicious PDF — malware analysis report

Static analysis result for SHA-256 6624f55f3df3273b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 03:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff0dfd8e87df0aed2c46b3c1828c2003 SHA-1: f3fad51e18581bf9a30f1f6588df1cbeff543f9c SHA-256: 6624f55f3df3273b6358d1f484dcfaeefabc4bb7c85c62135b06036a1838d1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=roadside+stand+class+12+pdf PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/20562295853.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/lavuwubulum.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/db2152d869020085b004f5673dceb6e6/25640191625.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/fojuvazaxivu.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/16881756016.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/72932657358.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xutoziw.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/67206746706.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d5b12cd9fe9b80b8ebc726db6d540e6b/megatidogojaxedudeko.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d223afec---51775723134.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/ranikifevete.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86731321893.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/21822078295.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/verenagudaguzom.pdfIn PDF document text
    • http://sushibelovo.ru/files/61397936607.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/108f05ad7922e9f7565d9d4b59c75ae2/laxazuxuw.pdfIn PDF document text
    • http://abwva.com/uploads/files/xeguvegediji.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812af5b65d4---68417299792.pdfIn PDF document text
    • http://mebco.ru/images/file/rilikogodutorufikurutok.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/tosafinokijinilimijo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f834bb7fa---87270752517.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/191845193293.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/93523e5a9643858f3b88f1d6c82113ca/pemalejowizewavov.pdfIn PDF document text
    • 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_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10728 bytes
SHA-256: dc75fdb7b649982045b01d94f72d754a46bdab56fe33606f179c4b4a9f45945a
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 17352 bytes
SHA-256: 5847c47efcdb5067d049cf65cb54ab64e5c84a86f3ff9a8855dfb5eaab9ccac2