Malicious PDF — malware analysis report

Static analysis result for SHA-256 8624169d003c95d2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 13:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d4ed69b3b38d8f685eb6fa1bc85a4a9 SHA-1: c3d611a4a2779aaa304b2923fe1dc8fa9ad3c7b0 SHA-256: 8624169d003c95d221969b39ed421bae0df0ba4c0884a1e76d2b65c49eb070ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://itemclinicchina.com/ckupload/files/navefibudowixafuruxurod.pdf In PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/83992451878.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kovivizidezitovulin.pdfIn PDF document text
    • http://freeski.hu/freeski/file/kubupoma.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b892ffca4dd---fojazitisozunuretasoruf.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09e47e473d1f58ee03fb34a6505ca16e/sudixipaxivejafebo.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/9079289913.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/02a9038bb26053a92a16b3ca8a65b9ed/nusugepowefuzapunut.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/54899459638.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/22135218440.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b0f32186---duxuwakobakanibobenu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/31017829449.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0981e037b6---2683620795.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/84692134530.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/52642204961.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///45666058776.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8om74p8ndap86b1fsrb84khnsk/71000134329.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a09758d0---zejuwoxexibonos.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/pawofurorefavujize.pdfIn PDF document text
    • https://airshow-bg.com/file/46362869140.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/54975116486.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/o88ul8pheuhcrsrf8och6udc54/91991611258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ems+internal+audit+checklist+pdfPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 10940 bytes
SHA-256: 8d6e1332a39d865e06bbc070612d6140b1b2dafe650f3ad7f31b4b94c15ef491
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16152 bytes
SHA-256: d109c71c3129ea325aaf30ce4269535349b5ac872097535dfae8483ee3b1d1b7
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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