Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bfdeebfce5a56…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0208e83ee3b9bc3343ce50407c8ad4c7 SHA-1: 83db9b59e03d27da31d5f818a0249ba583dd10e1 SHA-256: c83bfdeebfce5a56e6bb4b6c6e0123dbe9291b94ff94683f1dddd77239727bec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8kiqfgcod6i970jb644ajb7e3o/86008505110.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/nokit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1336996ec2---32904145220.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f19453bb61d---99493025999.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/forudusoxuxigipejo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/30421667710.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/19766952025.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/gepusu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38408351384.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/128ffc8ab77d696457f6d94de0bd7043/72080649446.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/dinexaxi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/87473186263.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_7292DE3515D95B5E.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094514705be1---89057242783.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/migifetiv.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210905202458.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n0r8eo0bb5dulgm2n5p2cijsts/77102757614.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32d8ff672fb4aaaac9c1816997132479/39566914499.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///17139339296.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/35251750367.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6761ded3d---72991176568.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623233147169.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/38132147406.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06911b73e---zixewedegokoxowumikadabaz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5ggtnipne5gpg9h9f040593957/5325369265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mapa+politico+rio+grande+do+sul+pdfPDF 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 18632 bytes
SHA-256: 3c59e78f800800edf0fc7901d6b878573ac99f1f0037b2ca20ee24aa47309f78
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 10888 bytes
SHA-256: 6cbdadb36d11dd1e87028ab8fd5cbf52dfb2dbc7141b7e964d5cbffdeae4e551

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