Malicious PDF — malware analysis report

Static analysis result for SHA-256 9577a62a621e53c6…

MALICIOUS

PDF

84.3 KB Created: 2021-07-02 03:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87c0e171ac2ceddaa09f0ecd7e03c4c5 SHA-1: dcd44cb8abd8795947da0354b44a58fa112bb77c SHA-256: 9577a62a621e53c632c42a2099358ddf41f3a1bc60b4efc878b6fd85b94b3f5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=catheter+removal+complications PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609159bd05f4d---13495119489.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72855609174.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079357a26a1b---jorotu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/tasuvagimupemedusapesaguf.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/52916230200.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a82818beff149478e52bdfde9a6f8ab1/genevozazajojilabejamo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/88363591432.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/zukupototesizunif.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/vilelelugufapifizisobife.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aa981cbe---71247435187.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/91053017965.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/6840277058.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t76dqrk77327oh1r87e892bhm5/83621377678.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/46631961852.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/52553698618.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/nufakodupeliran.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/qvjmfehlepcf7raccj59768sr0/3198856840.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/diwewewizilegizimaj.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/golujovaroxevafosiliko.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160751da072a00---dunipitepovimut.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35c48d0c0---36948430970.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/03e6e4d2417143063f563bc8a92aeb66/54317866376.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3771a2ce0721619156649fcb7b0bf2d/13285182569.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 17276 bytes
SHA-256: 83959056003cfe5bcc714f586fd7dfc535741c212d2059cac28af5c47e6418c2
font_02_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 10736 bytes
SHA-256: c6b94125a482c493d1ce39b5a9d5ec47c3bd74b7f61bc049d647e73f4b0d2b65

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