Malicious PDF — malware analysis report

Static analysis result for SHA-256 becf81269be8fb31…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 07:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6822e37141f6334fde9238c9ed083a4 SHA-1: 7375cc2513ef7c9167be4f933e624313cc8f564e SHA-256: becf81269be8fb31097dede0853bdfa8a0355d5ef193e173534846d91194e146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=the+road+from+home PDF link annotation
    • http://fazendasaojudastadeu.net/fotosempresa/files/49840565191.pdfIn PDF document text
    • https://jetaime-shop.com/files/84967372910.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34250091873.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080360047636---pupubipitosas.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc3cbf5f9---wuwuniwip.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/17420194881.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/93845055111.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf085294291---vulepopabomiko.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb38faea581---80175024550.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/209de392a8932303fc5ae3fa11fd80c3/67139816335.pdfIn PDF document text
    • http://saimiri.name/upload/file/39080526921.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/6581397256.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93eh481fhgbn74v5cn48lqr6s4/4771882600.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/83777766875.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/54211573459.pdfIn PDF document text
    • http://megalaserasia.com/upload///somujabiripixozet.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/96e3cfd7613e4c0fa4cb919210fe104f/gagoxebelemevav.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7a60ee8d972861410342b6e22d0e1d59/lesokiva.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/79j02ocbuhhsh4qqruuptdldt5/64003137126.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/26641280139.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/92039751400.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2315eae18---nasoxidito.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257dc866e6---27815961553.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/tamesorobegomo.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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10072 bytes
SHA-256: 97aa9eef9d1c54a0a82dbf57898369c0ab7e5688b31f500e7e8a1b5fea6a50f3
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16920 bytes
SHA-256: 0fa0ab25fdd26c93c35d2e43db0942f731aefc2fedcb09cfd7866f7f84887598

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