Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce42395c87d9a4e…

MALICIOUS

PDF

93.4 KB Created: 2021-08-30 11:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7675b6c88091fe0caf90cc88fd0efba3 SHA-1: b0cd2c969b36d78ce45af3e788833225cf96a36b SHA-256: dce42395c87d9a4e79074108b98cb2483ba98a527a13c76171e6f2ffba886011
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://interface-referencement.com/userfiles/file/makedadejavom.pdf In PDF document text
    • http://arcadia-fitness.es/userfiles/file/susajawuperu.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/44624657014.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/63435890254.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/48321638621.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8ccf44a39dd2915a5838eba6c17b5934/xosekidej.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1220f02f---18084350432.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gelovesufakivotazafuj.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/96759943308.pdfIn PDF document text
    • https://33mobility.net/uploads/files/9514682288.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/omubcqijrnfrp78t8tovjb0c43/80684627007.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25137daad---megojetiz.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/40c8f0bfc1103078211423ed93664ca2/gatebekikuwaruramagam.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/12567220505.pdfIn PDF document text
    • http://dollarplus98.com/images/upload/files/7266452124.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/85970941809.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/wotogozukexunerilo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9991083d0---taziwagepugupijaboko.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/900990331.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/webafolanekisetuxupumilul.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1daa2d88c07d01ed4a25209402a3a9f5/xekazinexenebud.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gquu28e73t5iuqmp99lehtme5p/94485323546.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/30595642617.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160782910235af---83373357756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=xbox+one+users+guidePDF 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_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10468 bytes
SHA-256: c70cd0866bef9ea36956e57e8b7e4661046e9f3fb497aa5892477dcbffdfe451
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 18480 bytes
SHA-256: 8efad6afed15f8928c728f45d319ff81c286f77b9793a0084d5bd2247fb5d119
font_02_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1