Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab35f243c43ad251…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 20:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22aff3fd87bc37326b1de25a681baab0 SHA-1: 65ba7b059ec537b56e851a79c5a03a37c727a62b SHA-256: ab35f243c43ad2511fc4103e01e54a7d4ad4a5bbef1097443d2bbf583066bc2b
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 or disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ombs.ru/uploads/files/fotavido.pdf In PDF document text
    • https://mimpishio1bet.com/contents/files/zewuwupuvagamizepumo.pdfIn PDF document text
    • https://podimercrm.com/img/files/bejarofob.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/86722310237.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/3451163166.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kugawagofomomokurasiw.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/27664190858.pdfIn PDF document text
    • http://azizolace.cz/images/file/18854104002.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8551ea292---82874622927.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/ridamigotimevorutuxuwes.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/wuwopixilike.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/poparitufikutumaridek.pdfIn PDF document text
    • https://nada70.org/userfiles/file/50507721593.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6d62bd64---patumujubiwesodigi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bacd835b73---begeperisa.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901095250673453.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/93992647020.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/medovu.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86023582298.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/jezowexigosufu.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/73828192105.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50935117777.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdfIn PDF document text
    • http://allier-genealogie.org/File:/januguwukirepibovuvo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/puwufudemado.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/dipaduvideparinisemawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hacer+backup+de+aplicaciones+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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10732 bytes
SHA-256: 8bdbef05e029f576a462e0b2e71a2ab09a14a73ad59ee8b616d87854b15a9513
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 18724 bytes
SHA-256: 94520229edb3602b1779cb8be65ff4ebf89ccea6e8330fbe7506da7bcde33256

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