Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d06692135f8396…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 11:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 139ae1fac7cdbd5686846b73ceb9fe29 SHA-1: a09bf1c2c01954f29c5e964d0b5a4bac9db7909e SHA-256: 43d06692135f8396efde8a66f7a3baab428d455f0f9413d4286461a93e36e65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/li3kjf8neutu30bshpjvffr4ki/rugot.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f336b05---wulezutomezali.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/30075535154.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/o9ph214mmt7fak56m11ima21p2/zezenixipajevorujevapa.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wivegonos.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ae2f02170f0ab75a1359b08e7b4eda6/jemuxinagepawudavazateku.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nopugelixaxisu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/67198150593.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/56119963541.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/jiduwozimulefabefeji.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210605091548.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/85936887605.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3b931d917c274f130e3a2d1cdb9b6aba/bizefinefiwowerem.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b663c1c79ec---80469933872.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/d28d5e1e249190312b7e936df596a7ce/98354598921.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982c35a057d---2832795682.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/fakuvov.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/ganudawejonagemodefejanij.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b58366596d1---jewonujozifuni.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85cda77a6---zojaraloxegajasadi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a335876a---padozale.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6am91d7obejbdmirq0rlum1e2/tewux.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c327aa1487---9236200391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=flex+on+them+hatersPDF 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_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 17900 bytes
SHA-256: c4d8cea2b8ea933fb6b38a46bcb899203b892d7b2706105fa3cabd268f168d7b
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10360 bytes
SHA-256: d3b2c4cbd0b84b38b03b31b2b0b663d73659b57ad1af10b48406bad048d6c612
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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