Malicious PDF — malware analysis report

Static analysis result for SHA-256 437bdcbdc81ef0ce…

MALICIOUS

PDF

96.8 KB Created: 2021-07-14 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edf87794ff35714827025acf36648577 SHA-1: 66fb81aa66ee12a46446753698ed131032574b6f SHA-256: 437bdcbdc81ef0cefc815db978d021286f69686ede4b82a18c12a739051f1f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783b9aa4028---68982117640.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4a77d3d6---63410878100.pdf
    • https://xistenze.com/files/files/6238217644.pdf
    • http://boschvietnam.vn/files/usersfiles/files/28493089744.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/adb9a34ffbbbc0cafd7155d36ec154fa/nurasejizedoxopesizuleb.pdf
    • http://beming.com/ressource/site-image/files/nesule.pdf
    • http://eotp.info/sites/default/files/fck/file/61562754376.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/988e238b288558ddadd5533baf12c88c/40741012641.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a426f6231538a86fb7a9ee4d627f338f/71767507055.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/vonarojoxubusurekeweru.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9abc22e42d5a7f6847d05d416b7dff4b/pogapanudamanisasudo.pdf
    • https://actor-conseil.com/files/file/loveguzeditamebujamewobur.pdf
    • http://studiotecnicodavico.eu/userfiles/files/26353981929.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gmcj713mp19hsrsr1kkkvhn9hh/metesosetavutizes.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1hlqnc65mhe78fqc42r8p7i7m/wizififupupe.pdf
    • https://kaptenhoki.info/contents//files/49894806459.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28c0c1fab---jabafu.pdf
    • https://cecprint.com/images/file/30479735166.pdf
    • https://aokman-drive.com/d/files/davedafu.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae58f172959---68769006367.pdf
    • http://automsystem.com/UploadFile/file/20210522044133858.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f789792e4c0a214fbb769720aaf2035f/6539643961.pdf
    • https://aedwea.com/upload/foto/bepemikuwilupasufiwetaxum.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4358a8f63b0a3ed6bd2bc0534efe6946/rirabok.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f29bb38d3de8cc18c2140b4712c150ff/68953608274.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079065852562---42715173840.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+missing+risked
    • 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_off00011a2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
font_01_sfnt_off00013242.bin
b6648af8048564c22dbd6a2a27fe932eeae8411cb195b6da352dbcae75ac4c82
pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 10324 bytes
font_02_sfnt_off0001490b.bin
31e960b3d9210fcd28e550b3ce316b170886d86097eb1c2adb657b60b591085c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 17252 bytes