Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2eb0a334d2a3bf2…

MALICIOUS

PDF

83.1 KB Created: 2021-07-19 05:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 76830b27cb56d79a169e96fcaff069b2 SHA-1: 7130202b426679c5d6849c63aa687fca91fad11e SHA-256: c2eb0a334d2a3bf2b7fcca17f22906a26bc7ad9b73e3388cd4257f9277ec7340
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f80a3b69d---ruvoketararixukig.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kgdtpgn56f8easphlku31gp101/sujebegixoxage.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/33299721844.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5esr4kddi6gk0bru61bc1ghndp/86961432107.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/gurusulabikesuduge.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/varebo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/5026339024.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/bewifiwuwizavadika.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/72363888434.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/sedalibiridadomusikarif.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/73325694840.pdfIn PDF document text
    • https://chp-travel.ir/data/file/dipibimeninepegox.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/51872759987.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kujizitavabaro.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/nugoro.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098aff9ea9a1---delavosazozukewufegupufe.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/xetuvinutudopiwelu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210528_155724.pdfIn PDF document text
    • https://termoformat.md/img/files/zifekunib.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/64lnc8ib66rkn88fscqgntlfe0/maluze.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/95855655801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ars+title+42PDF link annotation
    • 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_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 17672 bytes
SHA-256: cdeb1b3a226865db4a6933f33657b2b798cf5db12af429bc7e10911386fc1572
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 9892 bytes
SHA-256: 15cb9270aa0623bdfa4887b6f3d65dd927975d05b2e0431d0dce2761da32ccb9
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1