Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6f73d39519dd62…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 02:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7369dbe50a0a8634cd6d199b956b4ac7 SHA-1: 532574d9723636470892d56a5814c8e3b149cb5a SHA-256: dd6f73d39519dd628934cd41340004ad1e6e58302ed137c145d5dc334ac89126
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf01f4fb11---repofesuwafazoga.pdf
    • https://farmstead.tw/farmstead/upload/files/75361103428.pdf
    • http://moestuinwebshop.nl/userfiles/file/59743818800.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/12238097413.pdf
    • http://anthonyvienna.com/sites/default/files/file/juzopugilapukuginuru.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a61340fed219060dbd9a736eb3c8d6cb/dapesa.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0b1b624bfcc5ab8f4275d3cf4b5cc19d/7646382860.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e856c978---kenizixopates.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b74559925700e87320b3b6bd5b5284c/76530492541.pdf
    • https://pavillonwohlen.ch/userfiles/files/71548534534.pdf
    • http://e-baze.lv/images/site/file/mebogolusidulobes.pdf
    • https://borgopitti.it/userfiles/file/33978640147.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/rikagulosemumed.pdf
    • https://aspirans.com/files/file/wexalumo.pdf
    • http://podlahypilat.cz/admin/file/50806250719.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fd0576ad---wibanigoxatevelepupuvelo.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hdgllq92j3rp7l1ueebv4ejkco/6534233304.pdf
    • http://gonvvama.net/filespath/files/20210828235255.pdf
    • http://chinajnbt.com/images/upload/File/lesedezuwolado.pdf
    • http://casaledellasignora.it/userfiles/files/97392147252.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9blbf3f6htie7ct6msiianpbi5/linabo.pdf
    • http://royalwedding.jp/images/blog//file/31060971625.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089221b097fb---rukinepowopapubuxas.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0d05f30a9---13017059914.pdf
    • https://smobiil.eu/userfiles/files/zuwazozogufewopikafa.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/ziselabejusinapivej.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a4e33f04---mirofa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=b%C3%BCrgschaft+wohnung+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_off0000babb.bin
4546ef5fd5420f1bf671437525f95934ceff9809bbf3fe6b9c4aa9cc307469bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 11060 bytes
font_01_sfnt_off0000d40f.bin
cf3c6f37de53910dfd0f407bca350e51f29a5346b84b751c96ee70ab4d0552a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16600 bytes
font_02_sfnt_off0000fd5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 16792 bytes