Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8301d9f144da6cf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 771ec0e508de3f033c05f98162a6491f SHA-1: aade16ef650867a8e8b4c08886b41f85c81db919 SHA-256: b8301d9f144da6cf0e3d8703c9e7ae80ef5298730e814de300eed214040f5ce4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/52243621479.pdf In PDF document text
    • http://zhuoer.ltd/userfiles/file/valit.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f58ddd2fa---31302352450.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/xikamag.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/95120684896.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20037586061361f0188b9f.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/828255739.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/godobinumov.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/72434632919.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/sijisitenaweziv.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7daee27c---zewiwobawavutajevez.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/51119137473.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/fixinuxofewujosopirubexox.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139886d0f22a---getejegefasuvazutuwebatut.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/poxepowijewod.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/jafigupukalolov.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/gajupa.pdfIn PDF document text
    • https://aedwea.com/upload/foto/buwizuwilenixunuxuwinu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pujaronowofageru.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/midelarurigivige.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/52467765270.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b438472b---xopawogadidelimetomej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=good+movie+apps+for+iphonePDF 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_off0000bf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 16944 bytes
SHA-256: e5f454a68aabeb4c197f77c14a87922fe760be1fd12888a023bc057276a2440d
font_02_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10724 bytes
SHA-256: b8dc016021264b105be36c14edd57a6f97331997ab49b00cdb41c3c5058fd3e2

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