Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aabd5593c7b0e8…

MALICIOUS

PDF

84.6 KB Created: 2021-07-23 14:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f9dc0fab8fc44b7933ddfcd856e5ff9 SHA-1: 9f415c22f87333f31a6c5b80fd68f868ba0f6b0a SHA-256: 40aabd5593c7b0e83505ddb841e271d5550bcb15683418cda0a76491163ec53d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/86d9fb1e147c2aa41fef8cfac83de05c/numuxizenerenarovibo.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae762f1e1---fepenobimazudedakekamuwuf.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/90493984285.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/7688548790.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761bd7b7167---jofixeresegemofufu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83508dfd3---kijawaxopov.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8c536de2e5446e5218569f3e7aaa36da/48599445623.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666245b826---vagawakoma.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/safuzatibuloj.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6741cc953---jilaj.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/78175075775.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nezeredakodatuwejidomo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/kijemelipiloxo.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/banenokuwenixemowovekaki.pdfIn PDF document text
    • http://soles2walk.cz/data/file/21194955851.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716d1273e8b---41996889519.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/81824036026.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9a54e7573277c6236761701ce7ce3a76/vatezojefikiwozavebaf.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97525e8593---minedojakexegutu.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/08472cf3b4d84aff2f0ffe51433da691/juzebuzapanuzevaw.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b868acd995680acb19f8c738137644b2/84662834070.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/rezubakufinetepoguw.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ig82269g0co1fvmc8lousqq9tj/sakewopuzojarufuwixividik.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/51656056277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=phoolon+ka+taron+ka+sabka+kehna+hai+female+version+mp3+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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 17184 bytes
SHA-256: 4f47027ae695379a7d9fe0495f78545ac4bd0b64388110f5210a39b7da713599
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 11320 bytes
SHA-256: 426b3c29bfbbad02191a53adc94b9a71800bdb09513555ef406c48f63bb07def
font_02_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1