Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bb06969e35d540…

MALICIOUS

PDF

82.7 KB Created: 2021-08-29 04:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ba2ba77466642ff9eade8206943ee39 SHA-1: 5f29675c4b68b1625c984ba3a244f4fc6f0e66ed SHA-256: 29bb06969e35d540478ea82a55031579f9853fc9be7ea6cefcbbfc608667d8f7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://chambres-lannion.fr/userfiles/file/fapuzozagobubegipopadujo.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161192096c6a73---tebizarosawowazadedanuba.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/78060925257.pdfIn PDF document text
    • http://amdind.com/userfiles/file/bitimabosisupukezubo.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/zuvezajatir.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jcirvvf7jm834cu8b86d5rs523/17169471975.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bs6r5d9on91s5j3b55mjliv7u6/ruxeke.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/govarirurovu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/598b7d880d3b737528e0e92c0c829e07/benojadem.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f3c0bd9712ac3fca1941740d293a1003/47593361493.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/bazemut.pdfIn PDF document text
    • https://kede.org/userfiles/file/30990459763.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33500751831.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/89588978281.pdfIn PDF document text
    • https://ratosatu.com/contents/files/97592196160.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730783a4331---tubanunopebalofow.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae997a4d91200f5dd754a28c77ca85b4/4836663722.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sezipon.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/75009970168.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/mibeworipoxelu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/73517627671.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8ufgt2cb4bsrl2vl2bi5d3ojpd/jupimivajiwajevuter.pdfIn PDF document text
    • https://langumeistras.lt/i/File/rabijabo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96c27661a---29834376125.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8d3c4376985119cd0e8e7d17a2a727fc/23033899819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ac+coupling+capacitorPDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 10332 bytes
SHA-256: 77161c6afb1b72f22160cc23686bcf88d8d5a8eaf06f270dbd817040ffadf4a9
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 18212 bytes
SHA-256: 96039a0ccfed16bfbc42a8390669b67eb96d0c37e1141489ce91471f65025a6a
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1