Malicious PDF — malware analysis report

Static analysis result for SHA-256 4202e5acce4e87e6…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 19:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33d2f279a42c7ec615377f52ac89964a SHA-1: b48d75e18748b8787cf4e72d3994c21c8e3874a0 SHA-256: 4202e5acce4e87e664bb8cb8dcc4e8aa01dbf5622aec3ad99441cfe41d4658bf
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier strongly indicated maliciousness, and the presence of multiple link farm heuristics suggests an intent to redirect users to potentially harmful content. No scripts were extracted, so the primary attack vector is likely social engineering via the document's content and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f3a2376---vadabizesopegezen.pdf In PDF document text
    • http://lenosada.sk/editor_uploads/files/4749109434.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/wineri.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/50639296504.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/rirenapugiwuwurowipof.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/68175583672.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/gadiporozipetaxigeb.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/21241299315.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c66cb137e---47368407344.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fefosefutajolivugipejuwoj.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sagotado.pdfIn PDF document text
    • http://chinalabware.ru/d/files/22125860104.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6aec2f454a72ff89f03b2172a68a319c/78525074384.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fujegilojuderodemov.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1n55r2rqbc7rhnfqospn6r3ih1/xadarosovirifutovulira.pdfIn PDF document text
    • http://teraval.cz/res/file/ragiriwirulugugesesuso.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/68690973035.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/89379039cd6e94f2bfb2993b82195595/38632474245.pdfIn PDF document text
    • https://izr.fr/files/xegoxo.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091011333696.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83738323888.pdfIn PDF document text
    • http://tercovci.cz/files/file/volakaboratupup.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/daxosivufipefosiboxigol.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/vobebiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lol+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 9928 bytes
SHA-256: 7e59528e98ef038e2258646f6c23a8f3ae8bf12d46f3fa447825b2f376319db6
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 19940 bytes
SHA-256: 2a135a5804499f2b39889f204ca86b15924a91b54465169d6e410a2f1a230474

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