Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4343a8b31194aad…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 12:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25c8f5943b8f23cddf4115caecabdc16 SHA-1: b24736acbd327aef3aa5f71aa201dac0b42ef1a7 SHA-256: c4343a8b31194aad285147c8f17575f3757d8e87d29fbfd65c05f782a2bcb2e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://balletpanov.com/uploads/files/nekojozilunupij.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/28ee0ce7b3a06ae2a35142e7164340ce/49144520525.pdf
    • https://sysyanginguvenlik.com/uploads/files/83463570892.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/70486325534.pdf
    • http://atamergranit.com/userfiles/file/lotixapipolum.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/bogabimuxubimapuwazak.pdf
    • http://everbeenmagnet.com/js/upfiles/files/nepexamadipufixa.pdf
    • https://snqrsl.quebec/upload/editor/file/pavutodevaridabijadibip.pdf
    • http://hotelbelleepoque.bg/userfiles/file/47337508922.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/10044323826.pdf
    • http://www.mustwalge.ee/data/content/files/5062731007.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0a27566---24643001127.pdf
    • http://weldingplaza.com/files/file/9621016288.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/9526600888.pdf
    • http://nail-free.com/ckfinder/userfiles/files/pijokigijubomakiga.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/ramitij.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056e0a186a---74173892060.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/supulabibaremin.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/93142880966.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/lububixumidorigilif.pdf
    • http://ankurgroups.com/userfiles/file/63089967032.pdf
    • http://kawana.tech/userfiles/file/worifogixe.pdf
    • http://www.sauminandy.com/fckimages/file/35705986025.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef5fba63e---88251350215.pdf
    • http://kkagro.com/media/images/upload/file/78997726701.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+proximity+sensor+calibration
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beeb.bin
12c3e2a5a79b58a8bead8ba65d51a534e04f053aed02f3aaa65a5eaa7a32260f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 17108 bytes
font_01_sfnt_off0000eb5c.bin
1787b34411f618a108ed8ef5a1b9e18b62dca92f428bef677e9808c06226a870
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 11012 bytes
font_02_sfnt_off000104c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes