Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a950c0b457a3dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 06:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa3a72caec5f9f541e65a0e209419814 SHA-1: d54eaa83ade0f02b4fff3762deb7a40c21b3b1a5 SHA-256: 80a950c0b457a3dca97669659414ec255a3643de8241ad5bda01ea952862849e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to manipulate search engine results or distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/50755f1a5b7f93f0faf17e7c8c3653d8/fofuzevuj.pdf In PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/kosoledexulonuviter.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/duvomudodovenuleve.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/4465282431.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/71141126742.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/mizuloxonojewo.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/42806096657.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f08c258cbbf76ff978076dd07ed1d319/60523105231.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/pejujitod.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/59958336613.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613969aebd0cd---26045394371.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/maludunemunijosu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da426b9ce---74023796618.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf313671---88565423753.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/99088723862.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/42874981099.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614242fd7998d---94579735275.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/xavos.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/41829741940.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/49652797515.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/69235326280.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gululixizorunakusawinitot.pdfIn PDF document text
    • http://chinalabware.net/d/files/pobelorimukidolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mediahuman+youtube+to+mp3+converter+for+androidPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 11256 bytes
SHA-256: 1b5ade80bbab87108bb891b46544190978ece485eec496474be574a9026f6e1b
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 17224 bytes
SHA-256: 9c70195d5ba82d5e06081a23929b8bba6d6135dfeb8dc8f9772d3cd55e3897cb
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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