Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc5771104abeb7f…

MALICIOUS

PDF

80.4 KB Created: 2021-07-23 10:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 68755f996bcf7b78f1bcd942288f3bc0 SHA-1: 131607f91beefe113785e3bb39856306d2b6dc74 SHA-256: 5fc5771104abeb7fb75fcb4375292c0c74a7dbdd8f26597b5629abee73980b52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/g0clnvn0qijpgbllp699c95ub7/56983534950.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608112fc70359---22498330196.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/wutirumemakubenibatuti.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/28572102483.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f925e3b58d8083c6932b0ace58f48bdc/72150791220.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f8e7d42b---47472940652.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2prnelfh5t8ngdpbk2gvf1pcf6/levimemosafuvikiwu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/47608373734.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/tasafil.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tugelitot.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/19371140973.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vonoregikerelemel.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/dakisexug.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/8462535400.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ec6c0be7ad03b94041df1bd285e1d755/91124826433.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9120423be---58071721713.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/6534771906.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609d08e235d68---negigegen.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/95072159915.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6gevjs6r0n3tneakaossrno242/61689676587.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/82854209875.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607196f613e93---3879466101.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2mttb3kklpf1au9sj4dnhkbsq/vatuwelizujukifoletakaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+quantity+suppliedPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10624 bytes
SHA-256: 32d250fd06328299a568c6719026309d523ec74d2d19774ae359d0e36d7cf4c3
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 16560 bytes
SHA-256: a99b2dfa18c8e915ce2e50f153e749efc3743c69d98f9a4a63ec6b0611a9a5d7
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1