Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd71dbdb7786ceb…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 04:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 095a1598f57ea7c66ce850790bc63577 SHA-1: 2aed3fbad67dd51862d76634cebd343bbe203d46 SHA-256: 2bd71dbdb7786ceb76aa2f7d89f0d93efdde9694af5123653d64c59837ae6ec1
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 classification and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7b97ed6880840bce7a986f8c7eeb7459/36226587859.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/add7fa976962d9bc4bd62e87e23d8436/33913251404.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3d5d662331b4dd6dc93227fb23f7987b/fevebarawusiwawedogin.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160763b1d38a9f---pudojojiniwuralulo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfa540749---4701448875.pdf
    • https://alteanetworks.fr/img/file/gamafelonokajor.pdf
    • http://animalscipublisher.com/files/upfiles/file/wuwaxamofodesujevasete.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kinivuvuzetola.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v0r95b610h0s1ka03n8v21uk7e/wasebada.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/t34l9c8a4na24b5glm08hnpiv5/96055737298.pdf
    • http://perfekttorun.pl/pliki/lexaribomasapumemifo.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077062b128a8---tetuxutij.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa4f0b599---natixatefupu.pdf
    • http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdf
    • http://pagyesa.org/userfiles/file/20210608141714.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6838f44ae42013f3aeecb6aa1b0c8a02/pawopalu.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2344eb98346c337cd4345213b98c15f0/zapegaxovibukopipe.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/59b7e5f10198405f3ddb095327dd5998/vatiluf.pdf
    • https://ceral.pl/ceral/pliki/file/91728047448.pdf
    • https://fulzugaskozpont.hu/files/jegefufixajodapukil.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a360e23410a---66264279599.pdf
    • http://aceonlinementors.com/userfiles/file/morobovojege.pdf
    • http://cfacgroupe.com/uploads/FCK_files/file/rufomuribiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=synonyms+for+angry+and+sad
    • 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_off0000e9ee.bin
14dfd746ad666c837d5d6a82a82bb4e07a6c92e131e34ece56bcb97f4f503e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 17628 bytes
font_01_sfnt_off0001175e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
font_02_sfnt_off00012f75.bin
fd03acef915945744cb6a4ffb0545f242acd8879e5c4b12fbeae563533cf0b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 10516 bytes