Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d72cb99dba9c73a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 20:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9623df5ab669dcfc2484c2f713867d0d SHA-1: 4ee612d9a3dbe6b1ec6b93c1b96ff3eaaf505f62 SHA-256: 0d72cb99dba9c73afaf7574b03d730b2775f49eb75f3d01e49e531a79d3007ce
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to create a link farm. While no scripts were extracted, the structure and URL patterns suggest a malicious intent to redirect users to potentially harmful content.

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 http://jx4d.com/userfiles/file/bufafamanogaz.pdf In PDF document text
    • http://abwingstop.com/uploads/files/muzixowafaw.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/45681548892.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572b034a46---70847131663.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210708084954.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/roferep.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54989309102.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e08009bbb---35178258181.pdfIn PDF document text
    • http://artside.org/data/temp/file/daxok.pdfIn PDF document text
    • http://kfbi.ru/content/file/fekeravilumalifuno.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gifagab.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210817110025366.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/312535bc5e3b7fd737fef71dc0120645/90851701485.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c112323b23---zexojokupasa.pdfIn PDF document text
    • http://stasta.com/userfiles/file/fozub.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9c8e76b8---73224221230.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/domopamafamofega.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6c4cd4e3---21834811003.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/tuzedasinuterunuvo.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/87056364929.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/nufogasamemeferer.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ff8ec5811---94553210710.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/43636256441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=constitutional+isomers+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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 17392 bytes
SHA-256: 80374b714a989590b8f66ed48bd60d1dbc7061774e9c21af9e56c465c6e8ff62
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 10788 bytes
SHA-256: 4bb99471915158a6fa4c651be063c67cb441d97c2a766549b4bd720ec13095df
font_02_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1