Malicious PDF — malware analysis report

Static analysis result for SHA-256 693c5972149adb1c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-06 14:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9118fabd074f0a8a0e71b4fb86fb04bf SHA-1: 3d45f0b829babd22e7860e9756c181f262204fea SHA-256: 693c5972149adb1c14ae2542294ff94aa68fe0569defbcd376b18def1cb516fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=harassment+in+buses
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61288d873---15529311633.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/36a6c47c0231a839c5170a15eb535a88/zeriwejaganoxigisifiwex.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56ef9c652---dinixomeza.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c21eaa366---19274653883.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/10441099201.pdf
    • https://sieuviet.net/webroot/img/files/finifekaxisotojuvamutome.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nq5mst4kh7m3bomfkec8shrbf2/20090360187.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210702_6DEDC3A5F41BA35B.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b105483ac10---xezevomifepiwobezexoxif.pdf
    • http://sanphamhanquocymy.com/uploads/files/wobegebagikuneziw.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/33942r2sc9mrkjb9vf5gkko4a5/nopunejuguzitemu.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d532f19f---xifemazasusameripipuzo.pdf
    • https://balticstroy.com/uploads/files/71576305887.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9766542b5---79726665133.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/29364854190.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b0fdd71b7---luxagikeduriwosemipa.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a2e61b68---41212863416.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/19d3j3cnu0le95rj2gptufmb6e/84099022010.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2191fb257c29d338727960ef5b75424/kuduv.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee9616909---30416082855.pdf
    • https://timjanen.se/anvandarbilder/53/files/xovabumafijo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/wetik.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/eeb9a8f00307eb9a94033498099a6e74/37707581901.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_off00010508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
font_01_sfnt_off00011d1f.bin
f596736fab446e0c4d7010dc98fb42d0a46e1b3ffe17352573b6174f02ba64f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10332 bytes
font_02_sfnt_off00013460.bin
cb6f2bf42fac043bf19776c1fdca538735c0062bd40860ac8a26522491a94394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 19548 bytes

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