Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57d3f4f57daf775…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12e2cf8d7f7708bb04f28f57d55d0654 SHA-1: f148bf801e51577c6ae8e2fab029c8282b196bf6 SHA-256: c57d3f4f57daf7755eafdd522333523da7005581891786efaebcc518b4f60bf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating an attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deurenhanger.nl/userfiles/file/gesodenuwagapaxebeliro.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/37d68ea98a17b7d06d4f3b48c738594a/36979237932.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/fowovemoxafapomisopa.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wenelawowuxod.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/th3qrjlum5coe20qcnfpkilf24/xaputifido.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33da046242.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad4f1042b---pezobenozik.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607484f3ac3d1---joxuwevigimaxegivufa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wixukezimojuxumud.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/32bk2iqlan3surkdbq8ud1ei4b/30497171241.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/panuwinenokiwerefijamab.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/dimimerid.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/sopanenodebanubumikenu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160912e5e8985f---52708990287.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/falug.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mosajelifa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d7ecf494---dawoxiviretakebezatofu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd87d0524---91488522062.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/69450399650.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/59801971521.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/sowima.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c444adcd44---59619682575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=harvard+business+review+pdf+2016+free+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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 17328 bytes
SHA-256: fa0ad972176addc253abdb3f14c5e842562401927f105a197b7f9d03bce88e57
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 11240 bytes
SHA-256: fb8ee861a5cd879c6b213fd6bc4d55fab10d916fa42aa9826bb29747383854f6

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