Malicious PDF — malware analysis report

Static analysis result for SHA-256 099036776bc36d8a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 00:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6810a490e37be3b85d5c3c7e92660608 SHA-1: 0cca098a76981777ba2a744d213f4e041c548b97 SHA-256: 099036776bc36d8a5d8f4322ebf9c54260abd4b2e0195986e41f029f48047187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous external websites. Several of these URLs point to compromised WordPress installations, suggesting a tactic to leverage legitimate but compromised infrastructure for hosting malicious content. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to phish or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=ndlm+module+2+pdf PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d60a196b13b7b6999f1d3f95e58c448d/fenavudozu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pmo4jtv2iukqvpnfk5nint12q7/37678640627.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/dadodixafanozed.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/74701101592.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/zasazujimumukamironuge.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6916c392---powoneki.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0dacbbd0d---xatapevej.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/2982794837.pdfIn PDF document text
    • http://vhktn.at/images/content/files/78514923911.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/gigolajuwosuzi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4f3a74e4fb08eece86b5a9bd5c793259/87313293542.pdfIn PDF document text
    • http://mextro.de/upload/files/jusopedin.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/kedosiw.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15c7caf29---42626866258.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7sl7amd0rt3uk1s98bocqk8cio/9241307441.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///96441702321.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/82044749714.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb31419ec7---zojaso.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d9h5rduvfai0e93kkflk2tt5m4/falogovifapavovino.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xutisijefeburewu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae816ca4b---papaxukip.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/62168312661.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/95670676177.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/55626143449.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/26508282806.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1804413d---zowub.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/31350186143.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_off0000c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A4 17152 bytes
SHA-256: 2590fbed62fcdac40d14a83d5d769ff2253250afa6d739af40fc4b619b798401
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10132 bytes
SHA-256: 241065190b24c2f0445f26e0df86aec65b91dc565a0b0ab538fb6e1455d79984
font_02_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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