Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a51edbd979cc52…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2272343d546e109032821ba2e3e403c SHA-1: 9a52cae0c60aa0c19ca0e57415626c8279888181 SHA-256: c0a51edbd979cc52c857f55e6b569568421d184ccbff29fdb9a05e97b8b6d436
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lex-ter.ru/admin/ckfinder/userfiles/files/sikuzusokumewibotesami.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bf9244d3---26352671909.pdf
    • http://boothbayharborshipyard.com/userfiles/file/92594694110.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609280cf90e88---ritutim.pdf
    • http://computer-rudolstadt.de/upload/file/25149062175.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080504d6885b---52137265248.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160790cce363a0---jitawibovagojukozedutibi.pdf
    • http://nakajima-ya.com/upload/save_image/files/mizemi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b6c8e8d0---87013539733.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34ecea19b1---33050216877.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b789366043b---66629983182.pdf
    • http://fittbikese.hu/files/file/97644268069.pdf
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/31143643083.pdf
    • http://toonesk.com/upload/24538121845.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c21a5cd1---85442614790.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe50276ac---13269678618.pdf
    • http://king-ber.com/UploadFiles/file/20210624181658703.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/530672abe528baa738395baf1c8eb127/13474945726.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4eda4e29---numekaxarugesop.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/919gougmb2pna2ni6vcn63f434/78162522745.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a280fabcb63---sexadutupax.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da8e9518d---22869810981.pdf
    • https://amd-export.com/site/upload/file/pewapezimizajowivitewaju.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fabm9q237thrbbvohpr1dm9506/wubufoxipubawilegixut.pdf
    • http://fixafilm.se/userfiles/file/torofaligekum.pdf
    • https://grandhotelbulgaria.com/userfiles/file/zedutifawunuraxarunojuf.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/rirakinemav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lucky+patcher+is+safe
    • 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_off0000f19a.bin
df8a979df8b38cfb15951aabad582c3ee8ceb0f13c4f021546fd8a78f895af02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10572 bytes
font_01_sfnt_off000109fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 16792 bytes
font_02_sfnt_off0001220f.bin
d298e63545fe2c9a25d93c3f65b91fe4138b2331072075806c7cdf92368c1a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 18716 bytes

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