Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bb7e73350491a4…

MALICIOUS

PDF

88.2 KB Created: 2021-08-07 08:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 963a9165099491d999ee5bf94327386c SHA-1: 42e6cf514c854de2172c360662d72e402eb741d2 SHA-256: 97bb7e73350491a49d49b9e511913cae64d67ddcd12ac9e9f534210bda8543c4
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 sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous external URLs are sufficient to infer its purpose as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=explain+guided+and+unguided+media+with+examples PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/evk371qolp8p4jdssn1r21reh2/24827622235.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7bccf4ed59dbff77a9c78d88f284e505/xubox.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0b9ce72d0bc7009cca41e08d4c574687/19962573610.pdfIn PDF document text
    • http://allycatering.com/userfiles/75659309637.pdfIn PDF document text
    • https://vpmemorial.net/images/file/49027681039.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607920b11108e---konulerarisezi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/407665edfd58ac83630d43528eb65fd1/71859069931.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/40515489785.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a8fac5a1---3149104162.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/49335336821.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/26119872377.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/sugazojixinozajezavu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/85198150249.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d9144a32cf8591ff4f80f02fc8dea521/vixelisutaduxugokijokixi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6i3o3nn6nnql34i3oqhnfjda9/41604058427.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/tuveviv.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e82366112a2f0cc12e8e6887337a0014/16817870290.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cca9664f3e---xasonedojabo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m3dn0hkqk6chs2sle4tjj6nam9/76207812465.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/devuluvozejokiwogizena.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/31809407803.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/vatebesap.pdfIn PDF document text
    • http://toonesk.com/upload/47093782514.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72147183459.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c93e4ce16e---1431481760.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 10892 bytes
SHA-256: f1486ee0c31c88b2d6d1a5df6f4f7b842c69dfa5ac7253d1e3a08db2435dcc1e
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 17276 bytes
SHA-256: 15d9fc603895374927d8dde03b04e736e7dbff3098dffec8dc96be122b9a0be4

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