Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6cde6363503ae0…

MALICIOUS

PDF

68.8 KB Created: 2021-09-21 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 845d1a069ef9f2a45ce35036ee684585 SHA-1: 699e0925584e13643587a560320e66f834c8cdf0 SHA-256: dd6cde6363503ae0a08e29efcd68ec292da575f1e20573d97bd79b6d4534a9f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure itself is also noted as a link farm, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://resttour.com/images/userfiles/files/labomoforuwubaziperimeka.pdf In PDF document text
    • http://artwatch.ru/userfiles/file/mekevabepis.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/87274865625.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/tewagujijafetobun.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/fewonojubagizazofoleg.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/soviliwola.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/32359590140.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6583670d91b567e170d98e0983da5519/22991112167.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/61585259561.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/risatiwujotoxin.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/42376334312.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cc4d6d8903a1221b674736c1802cc8b7/koxorukakujupusatovilena.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/8963621477.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/muvabufawaxopubusid.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n5blnji9s9pmhk0hebfvf86sr3/13444947266.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/60976829689.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4190360566.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43450163342.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210919230350_485938006.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c7n2itr5mu6j4es6fj9rlp8gvc/82271745449.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a2bd2a615db6cfa0249f05bf35c35aa7/34214301033.pdfIn PDF document text
    • http://fabtur.ru/upload/files/17070074799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+top+ten+biggest+countriesPDF 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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 14480 bytes
SHA-256: 9b7d0f384df2a60cbb8bad895c1676f2559be293075ad103eddfcfd9dba4464a
font_01_sfnt_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10840 bytes
SHA-256: 93cb47ef73e06577fc24706734020fa25c85ac18d284d7c25e888e78164fcada