Malicious PDF — malware analysis report

Static analysis result for SHA-256 911267b2b253c61c…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 23:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3419554a0db8902027e0b5be9914dff SHA-1: a53b8e12b75d491af262090236e65201b7dad24e SHA-256: 911267b2b253c61ce1dbc94d5f981a08e0f416feddd519fca6fa51ef1eb42b1b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://files.ibiza-ferien.de/file/90245976257.pdf
    • https://air-separation-supplier.com/d/files/25377328869.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/vusadovomezasiz.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73074624061.pdf
    • http://sanarina.de/ckfinder/userfiles/files/16267835609.pdf
    • http://anpo.vn/upload/files/piwekorutekuzur.pdf
    • http://goodmix-psc.com/userfiles/files/bolazafibilidu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df1c379e763---wazebero.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad87e8a898---40623387562.pdf
    • http://amdind.com/userfiles/file/bopimusaselaruk.pdf
    • http://veronikavilla.hu/userfiles/file/9955524946.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965f9bbdf---32820088532.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0651dddcb2---suturuv.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1570e9936---fapuxakodunazul.pdf
    • http://incucinaconalberta.com/userfiles/files/fijejukikav.pdf
    • https://moto-trend.cz/public/files/fck/file/nusubuxaxuvuputenejite.pdf
    • http://t-p-fortune.com/userfiles/file/xuxesof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7279eead4e---wupet.pdf
    • http://mid-europe-ex.com/images/blog//file/lakezubu.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/029h7eril20ff82ao5aksg16r7/sexewuwuriwedetases.pdf
    • http://mingmitrcoffee.com/user_img/files/23197462264.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ba0ad512---14399609820.pdf
    • http://doo-san.com/userfiles/file/20210616002610.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dake%27s+bible+commentary+free+download
    • 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_off0000fda1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16792 bytes
font_01_sfnt_off000115b3.bin
eea159f30a41f575682cb7f839d8a5a32c1fce90b05200c7747e44f69d6a5036
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 18376 bytes
font_02_sfnt_off00014608.bin
747a2820f90909d3fb35ce2a07184bac931d3d0f80a30cd966fd942fd55545cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14608 11104 bytes