Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1d4a4c2e704560…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 951bd81427a4bfd309c227dc547dc529 SHA-1: 6d2acc34b7aad343994a2d179721fe8731138f9e SHA-256: 9d1d4a4c2e7045607240917f658b4e15c9049a2db8f3f82de5f221ad1f46d327
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=trouble+in+tokyo PDF link annotation
    • http://keralabiblesociety.com/fck_uploads/file/geloduxovixikekisam.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210831_198AF7F07BB5CF28.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/rezuwixikigenukikut.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/35951986463.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/39127011765.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/51980549495.pdfIn PDF document text
    • https://andhimazhai.com/images/files/6817864807.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53fadcad08070bedee05c611a4ccdc9e/40807026319.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/27743226164.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baacec2c1a9---dusim.pdfIn PDF document text
    • https://guijek.com/userfiles/file/vemafiwanuxipafog.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b29c890f467c9b2efd86a3f417ed9875/daxiji.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e442213700124f0b9d1a0dae1afc2ea/xigumi.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/24915550766.pdfIn PDF document text
    • https://www.elguantedeoro.es//ckfinder/userfiles/files/94519120227.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/11627835473.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/13048887801.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc39e7911---2188663152.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/93806313332.pdfIn PDF document text
    • https://t2sc.me/userfiles/fobidugamujixelugikititu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c358b8413a---fisiwasopituxido.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd7fac84d5d32f1ceb90e67ed799a77d/27285851518.pdfIn PDF document text
    • 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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 10180 bytes
SHA-256: 05eb82e3b4fc1880712e9b82f58c7c944e2c40d3e35654b05304c4b3ae6a780c
font_01_sfnt_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 16592 bytes
SHA-256: 05b8e8df61966c5a85f058d5cbd08e733e3819f1559aff68ed5f3aed2855cad0