Malicious PDF — malware analysis report

Static analysis result for SHA-256 4334874e8042c070…

MALICIOUS

PDF

85.4 KB Created: 2021-07-16 14:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b60da7e645d97ea3f942e46742a1fc8b SHA-1: 3241870a8e75fc80c1c9f9401a9a38fd5c27830b SHA-256: 4334874e8042c070a1de38aed5a46eaf9b3a8d32912740d4f1af03f1f1877a86
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The embedded URLs suggest an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834af2c5f81---96769277369.pdf
    • http://yuha.be/_files/file/86824386299.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4947b7beba---59904391340.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ebb9d2af---8269061318.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4ecb9f468b275738034f0049ac575f5b/lesefajebigojogelezas.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c8e64819a---95221056735.pdf
    • http://cherryontop.pl/upload/fotki/file/kixitejoderafe.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077737ee49f6---32840084609.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/311c8d795faa8dce8bb00a630da4b50c/tewiza.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/34e74e127e5086255789c436ec6dbf4a/mununorebelebuboximoxux.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iql58ssgjggmngm4v0tnh5ojn5/xejikamidon.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607634fde97e7---tegowomavudo.pdf
    • http://prodottoitalia.eu/userfiles/files/60101295256.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/7k2cn55sajoc5qobdehisjvk7r/jalodelereluxe.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4869b3cb9b---femisadebereweziturovili.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2fa8c6c6---23034649297.pdf
    • http://penzionriverside.cz/files/file/mijilaxojabuzusaniw.pdf
    • http://hud101.vn/webroot/img/posts/files/61959697097.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/23ccf719926bac2b6ed8f235ec67b695/14416040926.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mf4cf7mjmm3svbpk9ukmsilli6/litoxoguduf.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/nigivopapiresodowobegato.pdf
    • https://webtechnocrats.com/upload/file/puzate.pdf
    • http://malbreil.com/userfiles/file/mubizegel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=viral+fever+homeopathic+medicine
    • 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_off0000eaa5.bin
81f9e1492e165c0afda9f83764a92676ba538625ca19687ec684d3dd1a086d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 17240 bytes
font_01_sfnt_off00011807.bin
806ce3a9f17a0d77611d21a32dcb0f695703e003659336a86b0803e94287f36d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 10752 bytes
font_02_sfnt_off00013090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes