Malicious PDF — malware analysis report

Static analysis result for SHA-256 918ce595cc43a3a6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07f2cd1b85c19df11c25c8c71dedaa30 SHA-1: a981d442e09acdeabde39dce96e868b882e09e42 SHA-256: 918ce595cc43a3a68729ed8305b1f09d3c1d91cfb8ab61380a32e49f9c085e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=convert+iphone+app+to+android+apk PDF link annotation
    • http://ilink.pl/userfiles/file/xasabolotireveba.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/pidoziviwadoliridumizu.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sunitaseto.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/7493395980.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mofidurot.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19e72397---900832714.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/91528196094.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jefujokewa.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/31024623455.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136fa4c9789f---31140483731.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/balaxomoxofomu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/davutokegewevorelonadaso.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/munaguzifuwosovek.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904083348840075.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/74221937091.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fasekololuw.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/jatofomi.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/35549950474.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kenekodaberavetafe.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vogulexaminojena.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/46937069978.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/51413905265.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/70280052545.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/turorupebetoz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/13b84a076a416df001b763b656f40a52/xejukazogudalajigumi.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/58961939459.pdfIn PDF document text
    • 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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10464 bytes
SHA-256: 0c51b79e9494f3e801942fda72e2b1c5346ea4bcd5ddfd8a0de220c885031cc2
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17744 bytes
SHA-256: 0a273f126528bb5dd656f22dcead0f56c6617f3b9002482928c33b5137bd6a2f
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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