Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806bf17a70de660…

MALICIOUS

PDF

78.8 KB Created: 2021-07-08 18:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93c8bad3b25a560d03219b313ffa4edf SHA-1: 2355b478d4fa007115fad7895d4fb110a740339b SHA-256: 6806bf17a70de660834f8b53c314656288ed8fffc2aff6e7179968c4e021bca9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. This suggests the PDF is used to redirect users to potentially malicious content or phishing pages.

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 https://broodjedenbosch.nl/ckfinder/userfiles/files/xibafabuxe.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3a785d18---tovuxugipowuzito.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fpjpfv9luq4j0qv4jchja3qvai/61361828631.pdfIn PDF document text
    • https://kham.vn/userfiles/file/57918639835.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/be3d50a23e8fa8198184947c225f0ed6/71842019829.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7e577eb---74270498582.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15559169106.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c710fb3ad1a0f349efd844c67001c0bd/matonugumobazuliwi.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/44026509357.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5d100800---xupepezev.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/liwusunofovusadogejusapem.pdfIn PDF document text
    • https://majubesar.net/contents//files/20679670525.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/99820426166.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ul4bipijvagam50gqc97j1cldb/16107082540.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868241cdde9---tibakadijufifidof.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff9b1f755---30311528464.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aa9d4uk78b08haid1ba82ll3r4/98449765926.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xutozajaxuvuwegajugo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d53d0bccc0325f5cc134716f32a0223/fisaretepoxexebuxi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6ppklqrpb2h9dkuvaal6v868lg/65136953589.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/norufonibavimekatap.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/41418280059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+open+the+garage+when+the+power+is+outPDF 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 16296 bytes
SHA-256: 46481990e2d1040bce52229d64dbd6628ffad708ab3f64bac791e1f4bfaa2361
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 10664 bytes
SHA-256: b603a7d8e4e0d6c0b4b27c430663c36b66e666495a5b3ad9e801501814acbab5

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