Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0fd370c8fc0d98…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 21:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 498131f615db922463b53ae8e4b63e6a SHA-1: 18cc5e4c2b3a9510b5bdd9fe4d1fbb9bd668f962 SHA-256: cb0fd370c8fc0d98b5347d07fa0d87b776546c96a66d711064c948901775e3ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malware distribution vector. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vresponse.net/userfiles/file/pujivasuzorepofusizakov.pdf In PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/25191355087.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/844cbc5298ac605e73681c0259b9319a/29102544988.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/92369055237.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/nupumeloguzugano.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/be3414210d5d118213b5641b6ede0665/37378575151.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210802110005.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/38522010801.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4tghq07hnoqhk4ld8sa9vr1bdp/34759203938.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/sufigamuniso.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/49623678750.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c150bdb6c38---42683205927.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1cafcf013597d67394033928650f2fb4/rivulixijixolipej.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a2f62ece79cd0ab3f7e398cc4ce16ece/11950530970.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/90d1642c1cf46ab53ccf41b8bd5c18aa/7139966428.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sovurudizagawed.pdfIn PDF document text
    • http://bociany.sk/media/file/wimodolufeziviwuti.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xetuwituzuxakez.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46937b2633---kaseduda.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fdf94873e---79162818367.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/45555089291.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/74034212639.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/73265630195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=war+for+the+planet+of+the+apesPDF 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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 10356 bytes
SHA-256: cd51a884abbe401ee25c9e329faa234b1021dcc53bbc8a0d528dee355e324787
font_01_sfnt_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 16604 bytes
SHA-256: 781b9f669de6d008826a5bac914e7f18b4bacd45957971c8aac01d5fef90a6eb

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