Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14503d88f08a83e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 20:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23e612a0937f3f791eaab4a3021491cc SHA-1: cc7bc879144e6db5654701e0ef80addfdfce1330 SHA-256: c14503d88f08a83e483a50e68c6b797ea478e1f0eb8752cf67ac424c81999d73
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=spanish+words+that+start+with+y PDF link annotation
    • http://vo23.ru/upload/file/66329487801.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/tigawazovobapadi.pdfIn PDF document text
    • http://a899.net/userfiles/file/20794077437.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/69707448339.pdfIn PDF document text
    • http://ahknchem.com/upload/files/kaluziridelidexuro.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xegelufi.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pasinewitogepegitenaxupo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/65b3bf5d6a25649cb4a4dafc648dd24b/gezob.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360db942812---natujudajewemiput.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/dikipokugajunoximu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/tulaveseda.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kepifa.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/jezupabaxugefozan.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/tafag.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/tikoruludiliwusonukoli.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/70278424427.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614055d378fac---kofomuretotisalebobajib.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a51589e1f02a8017678e49c6416475dd/futuponalopexudela.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/18114628557.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/7541723169.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/gojida.pdfIn PDF document text
    • https://parc-hotel.info/file/6729467816.pdfIn PDF document text
    • https://comfort8889.com/upload/files/maxixizimitopawibejoza.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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 10584 bytes
SHA-256: cade7844f61845ae15340ad24107d093e981517864977e395faf94b698f8b973
font_01_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 15660 bytes
SHA-256: 872889e80a64da08ea8913d6fb284788f720c7f05a08f668767766d5a5745b7b
font_02_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1