Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78b6ccec4847c43…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 03:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 415618e115719641f1345c1ca3bfe4df SHA-1: 69c77c5c7bf7d55356528a463e4c060032825810 SHA-256: d78b6ccec4847c437e88df4d948ed720dd15e67b58123003c985b9b25a48c833
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/62397ca18d8644b3fef268718af210ac/zajituduta.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/91295523595.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/67797206233.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/tirulurawexafivow.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210627051921.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/75799422628.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/levadex.pdfIn PDF document text
    • https://viettrungson.com/media/Files/54395273326.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7956e47---sobomizuwososaxinel.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gaxigawukugilibamopeluka.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/30740428036.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/xewezatuwisito.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/814d1f418974690a06f57edb2979d1eb/dofotisifef.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/varigunutulimufodomid.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/27993746342.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fma12s6a6rkdg5idpm6lfu4h8/favaxojasujad.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a4349273---67083246420.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/fojuvinukifelu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/048f0716df94fe914667f2e3d9856199/wowuxawuj.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/6235547401.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f65b8f1---xewojapudimorazonikil.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16237746513237.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/549155ae54285a4a3f26b9f1403ae7f4/17844305903.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/61541241256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tesbihat+pdf+downloadPDF 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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10684 bytes
SHA-256: 0e5142fc12b46c94d69ca737b15c74499a6a8ec901a25b537110fc4b5ce92975
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 17472 bytes
SHA-256: ebf8a56dda3eb6f037dbda149ac70ad51bb62fdb19424822347f5ad2b2e1a3c2
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1