Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4b7fb7088968fd…

MALICIOUS

PDF

72.8 KB Created: 2021-07-21 12:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a349673d3274b2504cb072723be57f52 SHA-1: c89911160dec5e78ee802437701c15ff4f472009 SHA-256: 1b4b7fb7088968fdc8e63f4eb3b9a9eb57c9090af3a48bf3e016360908538206
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing lures or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jnnycc.org/userfiles/file/lonuteropi.pdf In PDF document text
    • http://mega-treid.com/userfiles/files/foliwurekevifinusigezugo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9cb36a7779f2b91edae81910e470f994/mozivoxalakegakuvubi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253525441a---14659558908.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c549ecb298---27750022769.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eabe17b38---52816683428.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/jigr2gjdqktr7077j7eq19hnb4/86787212331.pdfIn PDF document text
    • http://navigator-33.ru/media/file/dawagededosamozip.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/mipubexozevaxugagup.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6283e0e047859e91677669fa1666284f/55483485895.pdfIn PDF document text
    • http://www.toptehnik.si/images/75575230500.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/88608518381.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/97732563418.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f660b0b228---99116772027.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/zufuboxowiwiz.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/muxabelivajep.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7f178bbb---wasifusesijizorupemudufaj.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dudivekejixuremikivez.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fcafde50d4b8ef80378dff5f7c9030d0/66789245227.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/57144104189.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd1fcccbec14fa55d6c9b4020274f381/38967703871.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075815819f4c---paresiguni.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/turiweberodumelawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=traffic+president+cities+skylines+downloadPDF 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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 16416 bytes
SHA-256: cb0d5f3cbc8fc33fa78d71b6a6e57b69ee8d806a810b615bb9c4d50cfa8523d0
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10868 bytes
SHA-256: 0bdfa6f8523c3f34b03bb0158ec3c93413ce0f906223ea40cd21b63253c0f1c0

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