Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fe6cbef63395dd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 02:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb0492d637250b026ec3f925b355690b SHA-1: 760d59eda4a7c09f938eb6145a0bdefd987d6182 SHA-256: 40fe6cbef63395dd6df4d2bc9f1bf6ad8113b745eda199e502b72d496c378cad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Embedded JavaScript streams are also present, likely used to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=interpreter+cv+pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/nesorofebijixaziveleg.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/45936675103.pdf
    • http://asbufestival.com/uploads/FCK_files/file/57134563568.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pl8gualu447pl9bbbsk9sii6bj/resavigevewuseripotukuna.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d98cf5ebf48---11243927987.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ea71028eb0518cd0e817a66c0e9df2f7/tijifore.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/48mqhg70qjc84iqdgtqqr8pu05/2177024908.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/bajerifewokanagajig.pdf
    • https://client-sms.com/ckfinder/userfiles/files/dogaw.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f971c0f813445dd19390bca2592a5862/2613562487.pdf
    • https://hinaweb.com/upload/file/kaduvedutibataniguj.pdf
    • http://montaze.org/democms/userfiles/file/tilipefibozajetepitusekux.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6291e427d342d0ae9b328c09a0aa74f1/vuxapuwa.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/mikabiruw.pdf
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/11047831192.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/63713809181.pdf
    • http://soflocops.com/clients/67403/File/popapabogedabomudunojowo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b385125b591---fowodeliwufap.pdf
    • http://apcmagon.com/userfiles/mozexapipivejawoxabi.pdf
    • http://argyleliquidations.com/userfiles/files/80425352017.pdf
    • http://fipjp.com/userfiles/file/puxegesu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/72pvn8figvs8e6588qtmbgb234/56821610910.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fb4b12be0ed520258db67c2f94e9cb0d/70134826307.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_off0000de73.bin
396180015a502340eae0acdb713afd5beb8dd173c8b212ebc26cd2a78ace4691
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 10044 bytes
font_01_sfnt_off0000f4e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes
font_02_sfnt_off00010cf5.bin
aaa8a7e60008a7d2f23719fd3eeaed2b2c94dc7052b7be3db99a2259e635e15a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 17260 bytes