Malicious PDF — malware analysis report

Static analysis result for SHA-256 d583cfb666bd9056…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 00:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8556a4fdc3cd3d603643f4d24fc95b74 SHA-1: 0d22f9b4fd465249d7353ecfc6cc8bc63ce28aac SHA-256: d583cfb666bd90567eceaa8220021f00da2a740481c446da295f1c3a6b7b32ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities and download secondary payloads. Several heuristics indicate the PDF is part of a link farm pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://galantemontagnana.it/ckfinder/userfiles/files/nopagafajekijilukajepexi.pdf In PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/38842974519.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/fuzinal.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/gomusepajo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/diwaxajimosifixofovon.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/basobizerej.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37044899698.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c762903c2b457d11962b392d271bae7/segidakalufejopegelugeru.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/figidifaroruvusokasava.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/ninapipe.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/11048269566.pdfIn PDF document text
    • http://electric-kernbichler.at/suditaborom.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/48911646731.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4odpv6fasi9u4dsitgqcb3eev7/24107675715.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804f13b0d0---jevepi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb891109da---juxudufofarufexus.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210912104844.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40856289622.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jabaxiroxofab.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/37645042543.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lejosivuxidubo.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/41807823179.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/51951576304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lotto+winning+secretsPDF 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_off0000af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF85 16836 bytes
SHA-256: 072595a47c9a1d3aecc354d79156adeb4f21c9724c6331cd89501587bc2c44ea
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10240 bytes
SHA-256: b847d371fba38f5ea0b74bfbd1fee1aebd5f4179c42f899172ba50993da860e6
font_02_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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