Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d86d3c7826bf85f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 10:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 134a32141633201e731d968c3888f588 SHA-1: 3c4cbd5a0cc1457c471d962a82924aabe418dea3 SHA-256: 9d86d3c7826bf85f9ed516d5f44704f0db59f72a2176efb593976cb7cc9f96dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of URLs like 'https://queure.ru/uplcv?utm_term=download+gta+san+andreas+android+cheat' indicates a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=download+gta+san+andreas+android+cheat PDF link annotation
    • http://inistor.com/ufiles/files/45692004525.pdfIn PDF document text
    • http://nessium.net/userfiles/file/84290582985.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/84621190949.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411494845e9---mazifanasilem.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/53748331434.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/84218047394.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/tegitofexuliwaki.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907160707.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/mogixujalunupevira.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/18953606709.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/40681057167.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/41064824964.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pewabipapede.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vovigebuvorafasiwoxipa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/rekuzoputetugodusem.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109031409473020.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22b613268---bemavatedowuwu.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/jukalavamifam.pdfIn PDF document text
    • http://matras-devison.com/upload/file/ponovozazijukokobujupinom.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/detexuvujefikegok.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/92022729796.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf5b2e13---lodokudurov.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/66607204307.pdfIn PDF document text
    • 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_off0000ae52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 14624 bytes
SHA-256: f8d1bdb3d43e9bb6179ebd07f37ea4eb13b86bf5f2fba9d8f22ed14dbcf6a37e
font_02_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 10736 bytes
SHA-256: 558dba831b069603c8921a7e9c7b9a74b5487be812722e5a17fb92012c4cf470