Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6640bcd255570…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 16:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c674440df30c5522d033c63aee29326c SHA-1: f064f5acdcb1e485d92ce0c2cf935b00bbe90101 SHA-256: c6d6640bcd255570d721e14a9628e1e12e227a9eac017c93ba28996653b22846
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://theurbanbazzaar.com/userfiles/file/18774956384.pdf In PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/67310204317.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/41921376649.pdfIn PDF document text
    • https://braus.uz/images/shared/file/sabuna.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/74548866979.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/xamevamapuzudogev.pdfIn PDF document text
    • http://rrarental.org/upload/file/ximojebututexaleparuwajaj.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5ec24c6e980509dd540b19c75721d54/xilobonibovetivinibapaw.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/janelojabiseletexejajewe.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/28991199688.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c399b6e79---bemetetowimipapege.pdfIn PDF document text
    • http://egitara.com/upfiles/files/31262165369.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/mafob.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/547086366.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bc97c61c---kemitewigisoderowodilewu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/98753501886.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/29031838628.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/jogemeguxe.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/9850879164.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/39024402383.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/ditumozojabitenagurobosug.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/bizome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=disable+bluetooth+microphone+androidPDF 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 11020 bytes
SHA-256: fb62c84a1f5c1adb5da4c8343914b479f878071f4824775822438058865e7e02
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 18600 bytes
SHA-256: d218d941b3e695b45c598c56eb08c1d1c0caa2c2cd67585ca92b4d9afcd640f3
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1