Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fd0a4865444192…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21567e63f443598b5be4c16db0bf342e SHA-1: 382bb1d8c6037056da235d681e8d38443b3be3ae SHA-256: 90fd0a4865444192818ed44e4e303f58fccad786511772acd9cd3708250acce9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.hydro-tg.pro/upload/file/fipedemobaram.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dd92d0f3---70043886474.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/96212040679.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/82447a35c30017a21675150d8353d013/xadulumoberuk.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e016ee28954666cfc9d29d8d9fa0a393/devevo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/gevure.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/95865466195.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/givofakejefekoli.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kijuxabanupodi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1db1ed96---kojuwokokupevijev.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/70555220261.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j0p6etm6he955hfbubjjekfchj/639763185.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/vesiwojetafava.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afefdcd5d---rapijutamenufogamisi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/14b8682454402320580a8101826c8c66/jedolusuzupe.pdfIn PDF document text
    • https://wsbtitan.com/images/file/pobobanoporigamiwema.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/pakovikazura.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/50407112538.pdfIn PDF document text
    • http://rzfmuhasebe.com/userfiles/file/9681662471.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/81189438588.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/majabuzukogakojex.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16290571801147196539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=settlement+joints+in+buildings+pdfPDF 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_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 11024 bytes
SHA-256: 26092f4f95d454f309e53659cbb2d21e3f2236f6535eb2635aca2f0672c1b66b
font_01_sfnt_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 14936 bytes
SHA-256: 04a08eb21514532960bec9ecb27dbb4f7160b62b065348c71d0a7ec8695aad6a
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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