Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8e3d6a559b40b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 04:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2de998776f71733de346faa2f8728a94 SHA-1: ba599d9c161007f761b3593d1e474c7576d195e0 SHA-256: d8c8e3d6a559b40bce3d104ac549b3b37cc252b2f133c676e8b5918cb9d0e7b8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://fleshlight-tw.com/userfiles/file/981995560.pdf In PDF document text
    • https://prtl.pl/userfiles/file/litorutelizopibibupolilo.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/xilap.pdfIn PDF document text
    • https://equinox-e.com/upload/files/gizabimosoxerurik.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/86967594246.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a2d42d3e---vopanivuxukinof.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/51767935467.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e2d64e57---84128691931.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/rufadafamorexij.pdfIn PDF document text
    • https://fratellifurloni.it/file/mesenuz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2a5af0cb---32786391847.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/xoviwojebetufibexa.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/18i785oin0qul9db3k4gslevk4/99666558210.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/jogonasexuzudowoni.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/19174472027.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/112331396060b01068650f1.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7348994586df16bff3b6ecd4cb7bbd87/90507741275.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/fimoxelarimubesaw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610956d8358b3---78641984992.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4cfbea61c3f6b069a4c52a3e1621a8a5/kapibivuvudofidij.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92172797e---bovodepozepomewarutozajer.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa17e9eca---riviv.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/wegazatunobenepa.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/jewudutazesure.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/22u8tigagv4cf3clcttuh7pb36/75126856342.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/vojutirimebonadiw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/57ad573615502c58a06f94988f37b4a9/304040649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+fire+red+detonado+download+pdfPDF 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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 19268 bytes
SHA-256: 382996eb714ca5c7a2d9fa29c9299ddefb35959886c6d0bec936b57144c5a15f
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10668 bytes
SHA-256: a7853e032fb65f414fb51ce9938c28b18b6913c8ac52088864f495e97edce358
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.