Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5b3e49a20bde8a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 07:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d547e9588ff78cc160ff1c92ea987e1 SHA-1: 3324323c6c3a975fd5be30d6b66bbb3e31cbf61a SHA-256: be5b3e49a20bde8a175bea7b79b129df5c5d11e56129626199b28c02366d427d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or compromised hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be instructing users to decrypt an archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=plants+vs+zombies+2+mod+apk+hack+all+plants+unlocked+max+level PDF link annotation
    • http://wefocusdesign.com/upload/files/61866233243.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/61687425631.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/ronuvazidomowuvef.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/widavep.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/laxugoretowazadoxewibex.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/37329440250.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b5fd8f09---tukakedusodi.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/52721292049.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109151553511255.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/kofidirezosumatare.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/n7oolenf88jelct1u831dfk2o5/sufemisowoveral.pdfIn PDF document text
    • http://jawarakreasi.com/file/riwepodunuwa.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/80808730676.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/xarifutibinuzej.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/34773235655.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bafavopovoratosatodu.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/55256692190.pdfIn PDF document text
    • http://prosquash.by/data/rasogolodamuxituzopewidob.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/823207f8185d7f6c474f7ed8ee50b2fb/jizifubemokotifigaputiwe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/tpio804svrk78rkr5l6nv3i4p3/69364961089.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/19228088320.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/kajinozaletisemumezaro.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/vafaveluxaropu.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/67434451643.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_off0000b0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E3 11360 bytes
SHA-256: 9c282ed84971c76ec7d87603103edc867cfe079f890d2fb6ed6f9234f25cfce8
font_01_sfnt_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 14932 bytes
SHA-256: 2c07ed275a7b739ecf8f75d8796904047ccfc798463fb5c7aa712817af5acbc9

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