Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da96b0ada21d1a0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 04:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 843695dab1194a71b04b8f79a2cce645 SHA-1: f73db307211b54e03c4cee4d264d3c435139f654 SHA-256: 2da96b0ada21d1a052906858e3f5bed4e25523b1395b36b6a9dc3dc04a0c79e6
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest a malicious intent, likely to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://netron.pt/app/webroot/media/files/tinidikaludusute.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da40b34ab7c---teralofovisuxusawug.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a222b878458---13286259853.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fda14f0cd---sutegalidarepeweso.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160eda457441c1---posujatu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0918f37f---74991252232.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/purivewup.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/g16fjaopdrk1398q3p87skh95c/gonanixexolizopaxoki.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajuzitoduzoxozifezujivo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/25000372356.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8973d6c0335298c5a94fd4c306f7b56f/80209483013.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8u9ualoju1cnsptgabj1pt9ra5/61377797712.pdfIn PDF document text
    • https://wagaskar.com/media/suwitoninune.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wosexo.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/talido.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/19016834525.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/tujobubod.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/52419523311.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/97330299813.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/56497128115.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/80595427047.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/40416860201.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/sunolun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=r+programming+language+books+pdfPDF 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_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 18208 bytes
SHA-256: 48dcc7f3c362b21eed90031cd859d34aaff44952d06d58f30a2be8ebc61ed257
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 11120 bytes
SHA-256: e367cb789ac6d4d0c67796ef8a309a6a88b9cc575b05ad4b21ee81d8ed2e7163