Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c103a7d69d5d4d…

MALICIOUS

PDF

98.3 KB Created: 2021-09-02 06:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9a51b4f165048ecb425cf6d2f702bd8 SHA-1: c2d3c1676b7a515aa79bf7a6732387ca71b24a68 SHA-256: d0c103a7d69d5d4d7274618581f15cdde3fc955ea9133e0d059e6409bf5549f4
196 Risk Score

Malware Insights

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

The file is a PDF that uses social engineering tactics, specifically instructing the user to execute a command, which is a common method for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into executing further malicious actions, potentially downloading and running a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e466f48083---ruruno.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7dfa50a522---57063673397.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea1074e4a---91652058879.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f4a21377---zelavotolofavomalumifil.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/wobigijelitowetasoliv.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/78149585806.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/62913522912.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/35684886983.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/35717237824.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3go3a1aue4dca0f5necdn3t7lj/sixolig.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3585e32697---56942470365.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/83608493045.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0733542a06---54836218959.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/63000620875.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/90133657848.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/60947685888.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e606e953d---turidemaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f773b09b---55802135117.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d098637e9480596d3ad22d393738d1e9/jukeli.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vatijajutujubav.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/44641202361.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4lv6ll9tgd9dk5b34228nl21d1/zaliduraxilosajiguze.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/93526235300.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed178638a5---veloj.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/56dd5ce539065fabe3df1a45b5ffef17/56175050442.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/18702587475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=not+working+properly+meaningPDF 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_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 19232 bytes
SHA-256: adebaf884acfd2501dff60a2deec312ecb0a4ccf5ebcb18c7594623c91f006bb
font_01_sfnt_off00014aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAA 10696 bytes
SHA-256: 14c89f7f40cf1facc930bc164c8452c8cd1ccc806f66f02ae127e272eb844b99
font_02_sfnt_off00016343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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