Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d0b3d0308cff18…

MALICIOUS

PDF

70.5 KB Created: 2021-09-21 14:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3508dc2e931083cec7c17cf557552186 SHA-1: a84328be42803ee5b6e5b936446c83ff992e1672 SHA-256: d8d0b3d0308cff1841422169663e14caeee1abae019b047e9ea4fd38e3bb6e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://www.zochrot.org/ckfinder/userfiles/files/1918230379.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149aee51069c---wawivoxizaborokisisuri.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75133871474.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kamujegimediwerekodojesun.pdfIn PDF document text
    • https://tarsiman.ee/files/file/99322403998.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wekejagitejejisa.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/81652121451.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xitozagudele.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kafamibalonuboxuweben.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae70a4ec6cba74c5b9b142b1135a83d4/98359433244.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/15d55e598dc63d131cb16dd586ce23ed/lotokizamapukekogaw.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149913c0600a---kakepaxebulofotitodunosoz.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210919232645.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/butegelotota.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/34702505049.pdfIn PDF document text
    • http://land89.com/ckupload/files/46818386510.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/123af5554ce2557589a637004a174982/69832401685.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gibotugubodunanulimawas.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/pufetogimo.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/nunanararasari.pdfIn PDF document text
    • https://vendax.ro/files/file/83957540542.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/nogevejisutalikapam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tomb+raider+game+for+android+free+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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 10620 bytes
SHA-256: a5a2e527a3a5108aad07f75cc296a3ff91afd960d2b63bf7d1303c698cbb1091
font_01_sfnt_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 15120 bytes
SHA-256: 22e6586b8ffe7b6327ccb93c657a9b5ef38721ecbbecdfe365a85c2dc6a0a8f7
font_02_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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