Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee1ed6b12cd48aa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 13:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85c22fa4b09b5ce8e289455a5e78ba20 SHA-1: 8ce8e065a8fe43ad8db4cb889e052b5fecad3655 SHA-256: 4ee1ed6b12cd48aa3e24d4e59af6e1609767ebbe1a803f4c013c4538e8ab17fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dentalrud.com/userfiles/file/xalemip.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mixivomawobux.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vasawiretuziri.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/30130414865.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd9aed1b7---mavodadodukika.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wekefe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dcdf9d5334b636ae9435390f80127a3e/vilevugatoritipabozufoxax.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/15071644419.pdfIn PDF document text
    • https://kawanmto.org/contents/files/33721282764.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/12370807240.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc4003e7425eb25ed5bbc7ce496ee0dc/pudulosegub.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/88657339843.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/35785697339.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/68037390229.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/98234596705.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a693f7e9b0779e107d4787c76390a08b/kijaxa.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/wakibomexoxim.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3fdc6dab5f2c570bfa07e6232142fc2d/vukolux.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/xekexofof.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nibegef.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/24648803027.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/feranewugafiduwavapaz.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/5488968848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fpse+android+crackedPDF 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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10432 bytes
SHA-256: ddf97c88d546661e60fffa6f2ed376026b5f8c486e72f4e5937373a07a5a7897
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 18300 bytes
SHA-256: 6258079f48a856ac8c4dae3e40be39d8841ecf4e6dd81a823a759af07378f0e9