Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbd1b32972dff38…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 00:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5ca7d85b0ccd05933674e75bb430b144 SHA-1: c4aae5ed4340c16f172329c04bf0e383a0150039 SHA-256: acbd1b32972dff38ae3d99423a48361b21d5a3cc10af664503fd28b90f088563
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/32818675b5729cd3f013aeb189984ac0/12343373872.pdf In PDF document text
    • http://oodow.cn/upload/file/210912011810400715gg7pz0j6kdpr.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/vowakades.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c2d43ddf---sinanizar.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/nujebunojidexakerumix.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/naxogelizedelarogem.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/80843750903.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/80968863407.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/dakusakifafudefejula.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/45981839284.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/vakogef.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/xujoma.pdfIn PDF document text
    • https://doitoutdoorz.com/file/SDjXo3KCHqs1EazH.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/fajefomamilebu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/dfb6f94b1bc6e39467f5032c15f8aca6/10038022912.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeda44f73f---61420908330.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/kutezisuduno.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/33097719461.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149becc3b6b7---79445109912.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/55159110858.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/97171922002.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/92365822088.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/68117419500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zack+snyder%27s+justice+league+subtitles+free+downloadPDF 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 11308 bytes
SHA-256: 02c8a8f6c57a2135f76393d69b71c0c7b72c18629023e4af2690f804bc270efd
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16260 bytes
SHA-256: f35d457ad15dc7ce4ffc444560f0f56bf5c0650dde96257b6951d7362006b45d
font_02_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1