Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c094f89168d860…

MALICIOUS

PDF

76.2 KB Created: 2021-08-12 16:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cd3f496ea5b9de00f95c043c6ed2655 SHA-1: 1e66f9b3e646f6f8e150a0082af2aefb925630b7 SHA-256: 85c094f89168d86003653267767be3c3640d92924d2b70e4e29bc0edb1ae3536
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd40151eda---sanug.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/59337657206.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908416eea13---61191956309.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/magulof.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dba381730---50259625053.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/33696200366.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/81685719014.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c06b96d6---ginibavolibojemuxosolaf.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/mimipux.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babd6a24fa---28970439990.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/67109020288.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xewokipujorakukus.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zireni.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a67ca354e---zomesimuwomuxipizo.pdfIn PDF document text
    • http://qca.ch/userfiles/file/69763313003.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/16875409699.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3f4kb3stftg48hgsjlq09uo8v3/87484736429.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/40589273097.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/begemopemowokuxeguk.pdfIn PDF document text
    • https://mauspro.net/upload/files/43057262572.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/wisem.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/duxelevemini.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/69566751299.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c077a8104e---zenakowelutuzusavapadepo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lewelujobabufo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c618a3187f---benomolepu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ebc8d60dc91564a6a2db95a6314f744/zejisosokigud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=delta+bathtub+faucet+repair+instructionsPDF 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 15812 bytes
SHA-256: 7d36418cf87523ec345b40624b8ea8c35099c7d70f880ac5c72d1685624c65fa
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10820 bytes
SHA-256: 90a1507562629fd900677892657cc13e7cbc28638347ab4117dbb3b3edf6bc09