Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09f2ec92a62565e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abd79442e56284b54279e2db84989d63 SHA-1: 9fd5f6b23c553f0db78cc8545bbd1c9e508a9543 SHA-256: b09f2ec92a62565e3d890a568f9d8f10c32be76b4df8423defd0a2985adfa25d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, some of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

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://debo-fit.be/userfiles/file///52514202244.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/955bc0456c6ee353f80d619208b4b8f3/24450206320.pdf
    • http://celeb.huh.hu/UserFiles/File/midafazamozaniwunedarad.pdf
    • http://twfindia.in/userfiles/files/57748709745.pdf
    • https://unitjaya.com/contents/files/58240647467.pdf
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdf
    • http://kbcsisa.com/upload/fckeditor/file/47278859700.pdf
    • https://sieuthigo.vn/upload/ck/files/21473576193.pdf
    • http://ymmicro.com/files/files/nukadu.pdf
    • http://shyjjc.com/v15/Upload/file/202191617702559.pdf
    • http://oodow.cn/upload/file/2109182326064663384b7nms537g9e.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/lufalazojejubenefusamebi.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210917_230938E4D91583A3.pdf
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/85723200291.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/bivivo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139271fa77a2---bozabopozigo.pdf
    • https://jagamimpi.org/contents/files/82864024896.pdf
    • http://vuatoyen.com/uploads/userfiles/file/popewanemonetumag.pdf
    • http://fatimaartwork.com/userfiles/file/gitimilexov.pdf
    • https://rjpexport.com/files/72914585513.pdf
    • http://ciaomamma.hu/editor_up/lelotogemagotike.pdf
    • http://www.praasia.com/file/files/nuxibobuvipazi.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d259b0afe4772748e4757860c1e3783e/baxol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=calculus+for+ap+stewart+kokoska+pdf
    • 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_off0000b4d0.bin
5d2dd8f12444ebfaac70f71fd36ce7ebb5a5be0a7db73e8f145578110807a492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10724 bytes
font_01_sfnt_off0000cdc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16792 bytes
font_02_sfnt_off0000e5d5.bin
b58edcecd7551e799a6d83607610d1c744b0ebb76b8667319c78fe1303c9985f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 14352 bytes

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