Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db87714b432c78…

MALICIOUS

PDF

80.3 KB Created: 2021-08-30 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9a582e2fe051c4aeb880c84da3242b2 SHA-1: 797654d650aa078dea5840b58bbecf84d51fa9be SHA-256: 58db87714b432c78d13fa6885bc3a2dcca38c91e6cea3b059edd978fc83e021f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7bef85426---parijalovoluz.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/rudagoperojafovijifufo.pdfIn PDF document text
    • http://allycatering.com/userfiles/63990129527.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/20200139397.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/44397412329.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/73541366537.pdfIn PDF document text
    • http://temple.mo/userfiles/file/karapajamagizikutubo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16119aae7ef70f---94757529890.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f4496b0c029---reponewazaxilekemuwe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/401f4a489436427aa752eb4735587e5a/jegub.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q9rq87q0ep074hpk26gtkkbt1g/31770282783.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a194fb21800cf9176be4011bfa584847/85715605309.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/75383385662.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zumexalatoxujedupat.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/26136679025.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/46583030971.pdfIn PDF document text
    • http://liyangah.com/Upload/file/31251125141.pdfIn PDF document text
    • http://consade.com/userfiles/file/67570581645.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/11159785351.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d6622a5ce6---42155209350.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/74332841353.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/32498908462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diffusion+of+shintoismPDF 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 17712 bytes
SHA-256: 816b67bb2a7023ae7ffd5b10be1d4bf8c84526e846a5ee512438d0bcea8ae4b9
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 10140 bytes
SHA-256: 2e5d61c3fccd578c66897fb5db78d6a7aca5035aef2ee3bb3b6a0a2818b15697

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