Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc50dd13d5a52a50…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 06:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f6bcf0b098cdd472ead8235433f638f SHA-1: 99efb485e19f8c84961536964d25bf69455d2e89 SHA-256: dc50dd13d5a52a50c992407973bcf9ced1bad6f30b8b40d27d4e3857970eaf24
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gongotour.com/FileData/ckfinder/files/20210701_FBAA799F7C7CB79B.pdf In PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kepezoviwiwuvojorujesesa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e37886a4d---21174756028.pdfIn PDF document text
    • http://www.bash.cl/media/file/labusaxu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/84513899744.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/zafajesudapadodabom.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db63f0f3cda---164032812.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53278456482.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pakugadopefut.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/paginudigovi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec179089b9---vodogagemenisiborozukin.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/15468424737.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/86cb4bcd21fd181fe2940580338a077c/79427933427.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5j6ncmn1sleoasfqki1bfmql7g/99338099588.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gamireva.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/tezadininonale.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac3680123---vaditex.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc9abc4f9---xilari.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/vuxitaf.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51038e2b7---ritefagufe.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/lefogijututidemuzemope.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/880928ec1a74463b96fe49b07376f21c/nisub.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/kebuj.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/25953852811.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da9adeafa---bujepiliko.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe36333c3c---gifanakiwatajulivem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=main+effects+of+deforestationPDF 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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 18144 bytes
SHA-256: e7b7df1533ff68d744623c9bbe57d41d4275394c9795ff5fb90e4320ceff8bbf
font_02_sfnt_off00013066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13066 10416 bytes
SHA-256: 10e88dea710eda81a6e9cf7a6c3ca2f58cc7a8a76bcf95bfbe950e916157855c