Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ac339dfdf95c7e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 12:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e2fccf8bdd361ef0adc37c3b981de42 SHA-1: 6ca4dd6f7e660e03fc607a0d4d64e9f9fd8df87d SHA-256: f0ac339dfdf95c7e880e1146968ec27005fb569f1a4cabbc1225170543f1e750
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sharenkon.com/files/muwovevagerixepifobalazik.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdd26f6f8---munalipefefozem.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_130343.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/42458348156.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/76301401302.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tudetipebudo.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/gokuvipixo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/tuzajamafefes.pdfIn PDF document text
    • http://poorclarescork.ie/images/55893865520.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/2135641499.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacc9cfa65---74151756608.pdfPDF link annotation
    • http://tjsyjdq.com/v15/Upload/file/2021911045363309.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66310230904.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109110516485840.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/toleter.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/6078119223.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/35146233627.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8ecb94d---sebirogisupel.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971530173550.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/tegataxopivoxuvemefu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e021b7a36---95214437490.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/vamagupexadurenutosew.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/31104717407.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/nf1mk1ubrdu5he4bheec8bsk76/kenifeduludajoposulomebin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gogoanime+one+piece+strong+worldPDF 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_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 10984 bytes
SHA-256: a49b0d9fd51b6a4ee94d93d1bbf0caabcca0a6293eded9877b48912dee68c888
font_01_sfnt_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 17216 bytes
SHA-256: 02a7225801d933d444991b4aa96787c63c499a1a4dc7dae11c6ff3b2b55facbf
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1