Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b762d14070c9cc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 18:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8cbf5c57a9d6897d225f749691ba474 SHA-1: 333820b7083f6ab850fdcd3d52cf6757fe969d44 SHA-256: c0b762d14070c9ccc79a53da80213b10c9462f53270fbfd4e9118a8c6a7b888e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://medvor.ru/uplcv?utm_term=phone+usage+time+android PDF link annotation
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/24029250258.pdfIn PDF document text
    • http://clingac.com/d/files/dakuk.pdfIn PDF document text
    • https://upaspor.com/resimler/files/puvazutebesor.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7bb1de21---57062626077.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93003583831.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_224742_102.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/35415321383.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/79148530972.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/rabivafololavopu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/gubunipojapekaninuwowizu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29767901611.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/22517175141.pdfIn PDF document text
    • http://chromavials.com/d/files/ketebarole.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/79879887110.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38045745885.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d44125fb---ratolenejipigivuderejubum.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/98238841801.pdfIn PDF document text
    • http://hak-al.com/resimler/files/5710206037.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tclj0dau78vc6q7vql60t8m5a5/27332526175.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/wasozibageti.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618029f1a---toxesamibuzatel.pdfIn PDF document text
    • 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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10752 bytes
SHA-256: 1ce39248fba8b7b02b6c92a044591cd077887ed81f2c88e0c54a227090cca0e7
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 17620 bytes
SHA-256: 5b4389e033e77d848fe10da8fb0bdc8f3a3b51d4b8c22df6ed0442425200c974
font_02_sfnt_off00012cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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