Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6e3789d7387dcc…

MALICIOUS

PDF

78.8 KB Created: 2021-08-15 16:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54cbcd24902e3cc4526f9117fd47f653 SHA-1: 03b474d9b1788a210c08d1c721b606d99c054ed5 SHA-256: bf6e3789d7387dccd9f80e8992fd601160e763e5bc27959bc73b4d967d256a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lrjvrfe7ut7c4qco0gpofv8k0g/54788938724.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085e939d5e43---lotobezoxekugorepi.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/sodevagar.pdf
    • https://thefencedocumentary.com/adminfiles/file/31683654200.pdf
    • http://venturahigh1967.com/clients/40640/File/gowedava.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ff651306---75279476544.pdf
    • http://cosyromania.com/media/file/zepoja.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607974c60163a---ziguvemu.pdf
    • http://berbun.com/user_img/file/wirogigesizige.pdf
    • https://saam.vn/images/content/file/25968190788.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6630c3f4cb---nisirolopetilaju.pdf
    • http://smartvoicecom.com/userfiles/67858272224.pdf
    • https://acgroupenterprise.com/userfiles/file/vefeli.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/954830bb49478504ab55ab1c44e49d53/76478155465.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f8ba96612---tupejoluwizake.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/rijasojujapodeke.pdf
    • http://cupta.org/userfiles/files/20210531134614.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/86097823643.pdf
    • http://519pf.com/userfiles/files/wivinirexurojekugasunipuj.pdf
    • https://burstallconrad.com/editor_files/file/30365741220.pdf
    • https://bulgariapools.com/contents//files/kiwelazar.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ab3d4c6d---71929816720.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f5699ab80600c6f038ed52aaaed5d5c5/84330624136.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dibujos+tres+reyes+magos+para+imprimir
    • 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_off0000d105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 16792 bytes
font_01_sfnt_off0000e917.bin
51580df202e0131a85cac7a668bcfe7fab7535daa999028afb70fab62d729da8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 17164 bytes
font_02_sfnt_off00011438.bin
55226887d497a55539c2a1d53993a07a58a2c6e9d1ce135f48dfd30692c147c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 10928 bytes