Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c62b019d79abc86…

MALICIOUS

PDF

93.1 KB Created: 2021-07-03 20:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 892cb61fe48c739c44b632aa5ebf0c4d SHA-1: 30fe449c7c25c16cb7ec72fdb96ea60bdb8a4996 SHA-256: 7c62b019d79abc8667e8186ed8759923b5d875fe17e8806277bcdefdca106f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ketchas.ru/uplcv?utm_term=two+different+leaves PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc30285f6---jenomubosi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5e08f0cd---43757985394.pdfIn PDF document text
    • https://x-software.cz/data/file/nurexijimusirikewukoje.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fefetamum.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f8dbd62a0970b7ae3366796b84a818eb/kovolasojopumowotitufi.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/b06178826bd61e125fc57714f5824ad5/42506686464.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fugebikemopujo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d54f8ab01---zagawobevilogojogawup.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f425aa1c---nefujerejeferalud.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095bb517a353---riwomobitabojetiteb.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/19464775862.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dc0f0b99f01aaffbc33823fafffe8a0/kedemefugobesazo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/76586412905.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077e1da31d5a---23704869969.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cimp8mmio4iq2njbslqnditpme/3762574497.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/h0rc60ft9jnl9c1n1tf0gobvka/75223091777.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/bevegikatig.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///33285876294.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952a5e5888b---lanudavige.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fepugavexurokikejefo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8b9f327ff49056ea68affd5ae16e4c5a/52244196961.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba223757750---82208657312.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106230657.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46865651c---39519684502.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/sidekegomo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072813874cc9---popumomatovimoxeb.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/95aa096c9bdf014f93b729dac741ba0e/12702631911.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_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 10464 bytes
SHA-256: 8173b87b665e757a70feb16a85f18b933c12aaa8b8a273adfa94c5d61944d6c5
font_01_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16536 bytes
SHA-256: 9da0e6ad96f10074d687c13287f7ddbfef629d129402eed7a1d3298fab47a6ae
font_02_sfnt_off00014f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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