Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c6c412fde03bb…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 21:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a643dc03698832aed6199467a6d2839a SHA-1: 83cc8c4f8215beea8db006ce944aaee6b97a78df SHA-256: 6f5c6c412fde03bbc299e70315c5026361b3fe394bbfe90cdfdb10abc221c13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d664fc5338---62521435993.pdf In PDF document text
    • http://pobierzplik.pl/uploads/files/sozosujo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d6d7e99c---7015641749.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cv30gdhbe627nn0lpshhqol5ed/robokegolivuse.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rc7narhdcjiub6j2c9fin3411k/10032802104.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/80275250300.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ae7iasn5muht0hs8p1uhq8fn8h/9522870476.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jnvkr3ul26mt76lg897rb9luja/87847485120.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/65613e8e285a88c17ebb46e7d07ca954/95043000743.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0b2db217---59735834378.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/97676567769.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c62c8c20---27060746972.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/599c25ab983c9fdddcab9d61e669f1d2/vokuvusu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a59dd5dc---begosukamupefupenatosaw.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/28735631445.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809787c0e0b---33143793867.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b8d1b1449c22556bff29112d1c84fc6e/96971696101.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/kametelo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65bacaea0---gokikiravo.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/24768055588.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1bc430c9---1355433005.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b56d6875a4a80b09f78773a0c7bcc0f2/perusazoxoninekugoke.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e549a79b03320f3c355540753b4f955f/dopedine.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/55355555891.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/68967764774.pdfIn PDF document text
    • https://udruga-invalida.hr/files/razitaxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=passover+and+holy+weekPDF 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_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 17108 bytes
SHA-256: 2bf8796c31e55eac80e2c50fd1ca767de70b0b1cd74abe6591d10beef0f4c9a3
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 10516 bytes
SHA-256: 25508317aa00bf2111209d87d69f944d98a7789d161eb7d8227288df1128fc4b