Malicious PDF — malware analysis report

Static analysis result for SHA-256 0376561c6f919b5c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 21:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df296d8c09793ffabc6dc416cfa3bd1c SHA-1: 607a141b7896b2cba4c4baab4102f113072292d9 SHA-256: 0376561c6f919b5c1c32b5b4554dd568c35cf02a9457ca2f1ebf5f6378f3de8f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting domains suggests an effort to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=quest%C3%B5es+de+vanguardas+europeias+pdf PDF link annotation
    • http://guitarenko.fr/img/files/zegajuporamo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990c4e41b4f---28580690632.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/kumosap.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/mokifopoxezonetufoj.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c506db03---46547408882.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9b06a1aa040cabc916873cc11a8ee51c/tojidadeboxabiwapujaf.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d153432cd73d0337fa53b33e303f4e5/risogexev.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805878b4588---kebog.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/35584624424.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/09ddf46a2edbc863d1de067852c0a41a/zekotiraro.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/13365943485.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/bogovigojipiluxegevexuw.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807593683ad---marunelobilasuvegijigi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d678507268---82620700635.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdfIn PDF document text
    • http://emeat.ru/var/files/fetekofewezuwe.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e18a5c2b4873a9aa6e30e2e165b51f91/tirafewogulimu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/pogamaj.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/xofibel.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/sulerowam.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2eaadd36f66e73e67a6b6ae16a6372e4/kirijaz.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/a86a2673a9979fc9e052515f58f71c56/maputubaron.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bavoxipo.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 11076 bytes
SHA-256: 7102b2bceb3d63d635e65fb6a0ccc1a4a4f781bb8c5d55fa029747da73f71b4d
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 20184 bytes
SHA-256: 05be97bf29a9962020ca055346f867a6ca1db82481d0ca479639d280dbf9f46d