Malicious PDF — malware analysis report

Static analysis result for SHA-256 8091250a5f29548d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 19:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef1f92ccfa4d13746e4eba065700702 SHA-1: 89db22ded7d6c03c103ef6567ae8ffefa1cee7f8 SHA-256: 8091250a5f29548d38da757ad3016210c27e57d40e87209a0187591bb8917012
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 CMS upload directories, suggesting a tactic to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ikincielinmak.com/upload/ckfinder/files/nosetitagifen.pdf In PDF document text
    • http://hamdannepal.com/userfiles/file/togakufefuxikugubudokili.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5564cd524c33ca82f57f818e89eaa2cd/suzabuforerixabozaje.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/23882695759.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38404889122.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8dbb4be6---neluzaziduwe.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/87820626355.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/fejovegurizofulaj.pdfIn PDF document text
    • http://denge.aero/upload/files/90123950346.pdfIn PDF document text
    • http://cycling-software.com/files/file/xowomoxalegidogosopizekav.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29956c02ed---bizekuvaritolalifigufudut.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/bosuredakakudexunexetam.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/48ac5921dcf06f505eea03cab9072c86/84054577301.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/69300016398.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/aac2a524591c855c807526555cee7529/90470771162.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e1201f2bc---wukuvolitekimonoxadagefer.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fc789b4c854a0292016a9302dc8ea935/36640039281.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2ca275c---91799536843.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0a65b39b---76847328661.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/kigezajinufugo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/55256469907.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/38520472759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=conjugation+worksheets+frenchPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 11008 bytes
SHA-256: a39885ae02b1919ea4719f839b79a13c1ca2e92a2df5e680c3213de75bde7227
font_01_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 17384 bytes
SHA-256: 7206828da88138a420544d7dd7896b1f075d727a34db76669d85985743deca3b

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