Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c30d4f35735764c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 17:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1565ab2adca067c422bc547e334c3aed SHA-1: 84faa163e118e5fbbf84f15dfabb033614b022b1 SHA-256: 1c30d4f35735764c4c2859303a6d8167001c94955e1090ee5f64ab2b0e996007
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pappteam.hu/userfiles/file/61390591353.pdf In PDF document text
    • http://www.rajpuc.pl/pics/file/vejinapikatamiximus.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/lematapafemebewufum.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/surexap.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/59429766287.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/27494027154.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/17004398626.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/62182017093.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/55285415470.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bewitarimilekub.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/98924166920.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukarilojovojexu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614001eb9f5d3---fafugaferedobarokexuji.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/misejejoremaxeza.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/68349167950.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a5b9cc2e754e67d059fa96475f5c071c/kakewiwo.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/jinuxakawolojilimu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/51740764545.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d3bbb92eec4b469d160aa9fbe92bc4b0/refebarobuzi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/sojobulasubugojuz.pdfIn PDF document text
    • http://erdbau-rauch.at/53713555889.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ff5df0fd8htees9crkoe5pf442/67380719839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=position+vs+time+graph+to+velocity+vs+time+graph+to+accelerationPDF 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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 17964 bytes
SHA-256: 210d119b7ec1f3c05404f0287e6beac5dde2c57d12fb6276d339dfc8d0ce0426
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 11000 bytes
SHA-256: 4aa1e945e9a81991c782d06ec96a5a3b543a903887aa194e7b10842be5814e42
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1