Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a9e67d8eff5cf1…

MALICIOUS

PDF

80.2 KB Created: 2021-07-21 04:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8b7e55214f4ca3378485cdd6ca559fe SHA-1: bdcc7a14747ab17f5292733ab3442979bd00841b SHA-256: d6a9e67d8eff5cf16f71f1f99a83164e8f45172338d41a1af1193ee443b6cb6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4i2phsp49abfjacnjlbcpphlnq/40207144891.pdf
    • http://szilasfood.hu/pic_upload/files/11465279590.pdf
    • http://balogmihaly.hu/UserFiles/file/zigububavafozakeral.pdf
    • http://sanarina.de/ckfinder/userfiles/files/16866962999.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sdq0kk90amphbbqequ7skoujb7/42632128054.pdf
    • http://castrolmintabolt.hu/images/upload/file/gotutizavunediwepowe.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/2861882972.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079438b67156---jezaranasudafibobivosa.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b509q84au09aejpb9t1o3rkr86/79844523719.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/89e1dde8dccd378ea65e174c1f1d0cc0/wilafaduzovinomaguvipowe.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2aa79458c8---15269404864.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a52e69d23ad674cd84e3809f2be1fb2e/85279255881.pdf
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/2324299511.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b68271491fa---15726556989.pdf
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/90525670225.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607461e89319f---vixojupux.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/ketinorazu.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7040de1---91738164001.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8ceaa9bde6b2904586f7a9748ea8c595/35224936568.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e32d5654---zewazetivogave.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aca5d6b4a---68027427020.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0e314f0ace32e6eeb446d1230f8a242a/99843476253.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c5db965c---3377306350.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gfr6pio2v61445cqsitpnsasrk/ramozit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pearson+iit+foundation+class+11+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f7.bin
ff3e33d0d99601d4e3fe38347d5b400be48edc333c09c26d1f2898fbc31ced21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17032 bytes
font_01_sfnt_off000101a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
font_02_sfnt_off000119ba.bin
6a6d175fd247ebcedd557363fb1adc9cb7a58089183d79c80d8fb01c08dd4de0
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 10852 bytes