Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c1e2149b39ed64…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 22:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a80685fa24cd562aa056ed3a546ba5d4 SHA-1: 56c4c3fc3e312c9d16453d034b5b2c302d8a6473 SHA-256: 50c1e2149b39ed641a5b2d7948e5702d36f2e20e19ce7acee52374bbb51e2bb0
136 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting itself as a lure for browser updates or extensions. This is strongly indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a distribution network for malicious content. While no scripts were directly extracted, the nature of the lure and the embedded URLs imply an intent to download and execute further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=chrome+os+download+for+windows PDF link annotation
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/valadomuzab.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/didojawogod.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/68339202299.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1e3dd8bd75959eeb7bbcec63e38e2c3/tasuvapevudopurekowilade.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/tadulodebasibirezogedaxek.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/62796262990.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vifuxi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/sodipofeximagobewuwopetas.pdfIn PDF document text
    • http://newmob.it/userfiles/files/67104932657.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/56325a512c175bb4ad51bc4040c9141c/78246413351.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/35f3lq22po88uf58br5fufb4cl/69133135637.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/5772182871.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/timububozixuzi.pdfIn PDF document text
    • https://businesslife.com/content/files/90814203245.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/78911953068.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/ziluxu.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/9195241168.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fegumejilepofofexufetewel.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/3485341388.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/14918480054.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161347d624f014---fekegupigujesesenuru.pdfIn PDF document text
    • http://jinyezi.cn/upload/lezabekupavopovolitovota.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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 17452 bytes
SHA-256: 0f68a8a7761d3138ee592334b00f3df005d0894ef5cd84342dd9931b50c4b6ab
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10640 bytes
SHA-256: aa5e334570998c9f5465525e1b71c48d4d47c3de122ea1530011e74b7fe969af

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