Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a99f983c33fbf66…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 11:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06fbb3f7686f88cab57a408fe984a208 SHA-1: 3d6e3caed728e38a42569aa729bb2e9cdd05c0b3 SHA-256: 5a99f983c33fbf66071591bc51cb38af9f564cda00689173de79a3d334715c76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=zombie+shooter+2+apk+download PDF link annotation
    • http://kondicionery-shodnya.ru/upload_picture/file/mufubipojelofuda.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/95471641556.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/datalelokowusulowej.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/rinisa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0bfd81eb---simikogagarabilenupe.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/23986215574.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/zubufakeloxozatiminagado.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1c09bb52605b4c271d77a5ec0d469330/94414243838.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/33700257636.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zatalegegoxa.pdfIn PDF document text
    • https://kawanmto.org/contents/files/67207731759.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27888088917.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/51683843076.pdfIn PDF document text
    • http://sergeybazarov.ru/file/58846426785.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/32860238229.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613425c2989a5---sokukewonozonusawa.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/46304853267.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/39057542035.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jibukut.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/budegojepemerolomoga.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/9727962931.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109011446365894.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/18232856138.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v25oi8s2npb90e78tic1j4ppi3/75696367976.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 18084 bytes
SHA-256: f9cc148fbd9793b74785da4b5a02988684569e9287f354d7f40e6435de520fdf
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 11060 bytes
SHA-256: f63f9e714e69b6811a6499451bbd99450fe013d92224cc9d45f29138096bbb91

Open this report in the interactive analyzer, or submit your own file for analysis.