Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1ffb81de3adbfb…

MALICIOUS

PDF

76.9 KB Created: 2021-06-05 02:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2f4245e00779aed8c4810b82c4a69a5c SHA-1: 82edc2e7cdb5e89d88fc9d00e377aaa114a18218 SHA-256: 4b1ffb81de3adbfb0aa7f5161f91b47585c4cd3c5ae8f6a9e99f47c58de516cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution attempt. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=music+theory+grade+1+worksheets+pdf PDF link annotation
    • http://cc-loges.com/uploads/file/fadus.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jmstnrr58i0h6msd96kd4qec24/75878009464.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/sorijosisel.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5bdmjgf17hi6nv9e8m69fgnl85/xesen.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/978f347aaf08bab9893b5bbfc2d67b66/3088912451.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e8143be---babavoka.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160771c8ff1ec9---vowesigoxixojatepolidor.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gokawugagepanesur.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/werifabuw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e8e8ba58---kimebibirukinazototoz.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9b2724764e7d199df60afc2e7c62c4e1/pikemejofunigikibofabitem.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2ab4e5f963505fa863088b3a6ccd5b9b/rikefazukosokeporo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sawonugutoxigawunaxowit.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec1904da1---6967166265.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/79938560770.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb78a6dc7---guvaza.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/85697144862.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094043390874---47563049523.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/xanamom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 5476 bytes
SHA-256: aa09346d4b8682f8d98748c14aaad285ddd66b84111df29a7e5c4b945a067500
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10968 bytes
SHA-256: 5f768a67ec96c76b53b8ee6dd8f704e2c5949d3799d986fb2f7153ef93cf01c2
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.