Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91dbf4769b141a9…

MALICIOUS

PDF

72.8 KB Created: 2021-07-05 14:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fa0a77cea62cb4eb9da002669aec543 SHA-1: 632fd42f2a978708dbdb2521b9007ee8b35aa90c SHA-256: b91dbf4769b141a91c4d2b391468e6170b869674305a8d946eba2adce1cbb3d4
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that redirect to compromised websites and disposable hosting. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

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 https://inwebjor.ru/uplcv?utm_term=eglin+afb+tickets+and+tours
    • https://aedwea.com/upload/foto/50404148827.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vjtqe6b8erj18sjb295qcq2au7/56575442859.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ad3b27224255d9b1d8ac82601d61d207/50495998076.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/67acb0a1092264cceca5ce83cc366ffb/24127770137.pdf
    • https://cooperspick.com/files/xewerug.pdf
    • http://botosani.ro/img/uploads/file/87288137053.pdf
    • http://vhktn.at/images/content/files/4549745208.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/fuvikas.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb2e3caf54d4e5e4d374ff8f60998a27/nozorawosika.pdf
    • https://soltendance.com/stockages/files/kutibomimofozerova.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/niqqnj1qlfhrkndh8kiuqmotu7/zewufev.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4425497cd---zudoda.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/99620013827.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c22aa3f908dd581bf65b47f42d06b6ea/borototafowatej.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/abd622879e7fee91ad267048ac1559e4/90021988908.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc0ba73eba65ab02c2dccd4c26d9f245/movigukuvakupazam.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4358a8f63b0a3ed6bd2bc0534efe6946/rirabok.pdf
    • http://bright-inter.com/file_media/file_image/file/6808811905.pdf
    • http://alituncer.com/userfiles/file/44262325826.pdf
    • https://bakwanudang.com/contents//files/77033115005.pdf
    • http://renovator.cz/files/file/28964247519.pdf
    • http://shs1977reunion.com/clients/41590/File/77778433339.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076caa9029b0---55736086958.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e8147f6e---zepituj.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/36111579028.pdf
    • http://yorktownhs1987.com/clients/57482/File/20142843271.pdf
    • https://tectrongim.com/uploads/files/38524060558.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/24268c3971ef2470e6fb42f07439179b/puvaxosan.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_off0000bb45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 16792 bytes
font_01_sfnt_off0000d35c.bin
92f134ddb3b40ac386a28ca05aaee13d8a05ec4980b520ff8e5c1641d3751eb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 10964 bytes
font_02_sfnt_off0000ecbc.bin
66420c2a746d9cc2192540f2dc19e39cf45d2b34a8a9d8c5d5a620a176639c46
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16152 bytes