Malicious PDF — malware analysis report

Static analysis result for SHA-256 00210731be6be69e…

MALICIOUS

PDF

86.9 KB Created: 2021-08-18 17:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9415bcd38cf149a0a72f7c11a9488314 SHA-1: 252d440e9eb8bc07bcad76dd3633a45e6d264a17 SHA-256: 00210731be6be69e200abbb05e0d9c40c71b96771cb860a2e0e99c1aa762b191
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous URLs, many hosted on compromised CMS platforms or disposable domains, strongly suggests a link farm designed to redirect users to phishing sites or download further malware. The file's structure and content point towards an attempt to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://lederstuehle-shop.de/ckfinder/userfiles/files/wavibiduvixivaxosig.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bd3742bb3dd3691583add7211d022c5c/21992406392.pdf
    • http://tomaszskiba.com/userfiles/file/65749692626.pdf
    • http://omonetach.pl/foto/ilustracje/file/donaladifusejegiwok.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9458f33269379e0eecc9001945563b60/gojuwawutabawumugufo.pdf
    • http://shuswapladystriders.ca/userfiles/file/51101866154.pdf
    • http://nprofit.hk/userfiles/desadasatova.pdf
    • http://salonorganica.ru/upload/files/zebazozabexawevijeb.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/tn11ukfhidhvemo6puorv5lhko/63428102425.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/64968a9f21e3ee21a7e366518ee1161b/selijapewixorakomizez.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ec09d91---lesiziwemotuwulodif.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eef397d7e---48300553408.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c946a4bb83---43724064883.pdf
    • http://cnex.cc/images/blog//file/86008902425.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bc55e74b1---xuzadoguferumijev.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55919c345---74131516092.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/8324519986.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783845f2b45---40211422610.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210614_06F6BA6D0F6DE68A.pdf
    • http://studiosiciliani.eu/userfiles/files/depofubumoraxupogezak.pdf
    • http://emailreceptionist.net/userfiles/file/burunaso.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d0128a777---kewemesogotoredixawanuvi.pdf
    • http://qunjl.com/userfiles/files/83076299077.pdf
    • https://ibeguiristain.com/userfiles/files/fidik.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/53388174096.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/00bf328302ef484bc1607eeae329d034/45756349716.pdf
    • http://nhs1968.com/clients/65482/File/70624324688.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comment+exporter+un+fichier+excel+2007+en+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_off0000e94e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16792 bytes
font_01_sfnt_off00010165.bin
6b34f5e540791249b95a7541e9f372b958eb612cab4d563ffb95e847d3ce45c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11080 bytes
font_02_sfnt_off00011b09.bin
9c8b147643e17a7233f57b96c74dcf521a8de1ba6f3252357bc34d3f8fc15c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 18776 bytes