Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2f2ece7b8f1858…

MALICIOUS

PDF

637.3 KB Created: 2021-06-24 09:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0dc35a108ab959223412601499a60a74 SHA-1: 2c5a842b0ce103415f6f658e5c257afefedffb06 SHA-256: 3d2f2ece7b8f18588ab4a8e15f8470fa070f0595c11d4081d9b45359f2b54146
126 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links to potentially compromised sites is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8371

Heuristics 5

  • 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.
  • 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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/31d72q0re943b5en9kfs75dqv1/87716181521.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/aa31df83c237519831f9374b0735259b/89217132801.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/14035407740.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sdgcnk2ieaov021ta25smcls4a/8238113260.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada23239ab---jowezusevupura.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ad08564965891d47972fa97525487830/23057728943.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad701039---68480056706.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/18ika5mcaelv9f50kvdmu1ms70/1430357962.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7951316b11---tixuvejudurazisebafiro.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afkg7h2p6h1ipmb48f5o4itbf2/gerev.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nenasanufagujate.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rekqrksr0biubhja79smi0v742/32601825614.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/99726212151.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/424153692.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/mumutuxinojakuge.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/51055433505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=introductory+quantum+mechanics+richard+l+liboff+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0009a212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A212 5700 bytes
SHA-256: 9ad0fb45c4deb8f6cdd90d077bb7f6584cf2b425daeeaac5b5d660d47ed40d50
font_01_sfnt_off0009b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B54A 14108 bytes
SHA-256: 520d35db2757b75ccd3bfe029659f1001545bf06808090644395ab00c3043d08

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