Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d3681a3753f21…

MALICIOUS

PDF

143.8 KB Created: 2021-06-14 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d97d9ba192b95f0370cb34f682b3cf1a SHA-1: ce3c51d89df2a8b4a67bf382ace07f777eafa4da SHA-256: b55d3681a3753f216c5c199aa4317437f76392c3fce0f81403a3cb8732e08fb8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable hosting sites and compromised CMS uploads, disguised as a lure for downloading Justin Bieber music. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=justin+bieber+love+yourself+download+mp3 PDF link annotation
    • http://urbanconstructions.org/images/uploadedimages/file/duxubomoronujilujixodew.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089faec52906---78627185373.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/68889546759.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/trda7u7jpipijpsbav82bggo1i/dumenasasizevewi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/904b8a19131540616c2906adae6486ee/ramobubovajinubazekoke.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808fb67c4db---85187204184.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5769cc883e---wudulilomalezinadofosi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cb3ab214---44763698371.pdfIn PDF document text
    • https://tavio.ru/files/file/90708869957.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fbb08c70c9e8ea9e301012e26da0030f/gipepugemedarakuv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3da26c92dfc5bc5d04c3024b457b16d0/18919836084.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa35851bd---97881467028.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f81ec7cacd6b5276d8768657779598d6/jadidanebapiwuzogubebaxug.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608857ac067d7---mafitij.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/geselapawurino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA6E 3860 bytes
SHA-256: 0bef73f2dc1daf34ed64a57d55e1321f8ae8ba820b2f521ee1e749d3a4e6fade
font_01_sfnt_off0001d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D808 5732 bytes
SHA-256: 4816675af9ef4810643f38a03b3f65db02c6d388f2f3bbe6b32e13f390303acf
font_02_sfnt_off0001eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB8B 6764 bytes
SHA-256: 1b99319e5ad05f55d237e21919cc60c0766839e2441c13bdc64cf0d27e63c701
font_03_sfnt_off0001fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDB6 16032 bytes
SHA-256: 064b617ff85679a1256d8c70ae5ea408e0bd2a379143ecf00cc33e37a9231412

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