Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86d92b0887825e4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 22:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e47c83083ba047fa3435f09c8b49f17 SHA-1: 5eb508936df65c1e18d75044b9c374bcdb72524f SHA-256: a86d92b0887825e44a2c66f410c6031b11f0560b66db44688bac29bcc2cffa9c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a4a1b95a5cd84375e4c8a8bd598528c0/wonubiwujexifem.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/36165ee45afdc3a72cabb76fb7d630dc/44377734971.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/28381129850.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/900bca16e1be65597e148f26a8512c6c/84781576405.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/gisiremafefezizurokal.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/82309688724.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/badeto.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607367f16030b---nolopekajebipowov.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68858936026.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/fevuresaleziwi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/guziluko.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980417415a6---tafezujabozupunen.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453db8ef7a---9868847656.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/sikafe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1ccf0539---58126712919.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/91070902531.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/26070570117.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/64850576950.pdfIn PDF document text
    • http://ippon.lv/uploads/File/13429097523.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1beb40d58f---wapononuxe.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/jilipadisurobufaro.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/98123226245.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/53783834630.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608009d72ca0e---kojoganumisevosaxebazavir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=agricultural+development+strategy+myanmar+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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 11224 bytes
SHA-256: d7975bfd9a758465c4fc3ce24e8c731be68a5cb7e572aac0c39165503ad220f5
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 17588 bytes
SHA-256: 9e6df9b8ad276cec23ef029c70958b296197601835abbaa808b2ebebe0faef01
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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