Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b2852646d9e7a5…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 04:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f32e136a21c1797e0df241090343b82 SHA-1: 7fb27beef7943c1073afc5ce2318165b775c4c48 SHA-256: c0b2852646d9e7a5e5a09d34b29c263759dd40402444e553e7d332f18264d156
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://autoscuolapezzano.it/userfiles/files/setukodidukikojexawu.pdf
    • http://cobmedia.hu/include/zawapaga.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/xusexigojiwiketojegov.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161532784c6adb---26371816493.pdf
    • http://gzhangqin.com/uploadfile/files/ximutulisupudabajefofikax.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b603b86c---dapefonazodokudax.pdf
    • https://0a3exp.com/upfiles/editor/files/zofefofejivugatolululo.pdf
    • http://geodavidepini.it/userfiles/files/54201524082.pdf
    • http://macabrey-luthier.fr/data/Files/55425299437.pdf
    • http://hongdacable.com/d/files/jujijulufatigarajilumud.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/kijukafileba.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/51139471259.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/34718579125.pdf
    • https://funbugs.ie/userfiles/file/83366230581.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/67501030162.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sekaxola.pdf
    • https://oazapiekna.com/zdjecia/fck/file/30047143089.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614137ac81cf4---70751269399.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4ab8abbf6---87892157872.pdf
    • https://triyoga-tv.ru/userfiles/file/98769897021.pdf
    • https://truckforceone.com/upload/editor/file/42256373553.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/83289149187.pdf
    • http://georgekoldun.com/var/upload/file/novex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+hack+slash+android
    • 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_off0000b221.bin
0095c2d86f84131a00ed09101bfc9d3b771e0b3c21d52173d549d070a38479ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 10612 bytes
font_01_sfnt_off0000ca57.bin
a6d09871bc5e18cf4263954f2cc6145740e89727155681db077ce4fb5dd8e527
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 14960 bytes
font_02_sfnt_off0000efdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 16792 bytes