Malicious PDF — malware analysis report

Static analysis result for SHA-256 064f60edbd511b74…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 08:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4f49250a3f61fbc41cd8c7bf0d1decc SHA-1: c65d0c3f9a45cf4c19d7649d83550ea35e955605 SHA-256: 064f60edbd511b742fc075a300367513cfa70ba8bc94d36ac9a68053128f6e8a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm, with many embedded URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The primary attack pattern appears to be a lure to download further malicious payloads or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://menuiserie-sainte-anne.fr/userfiles/file/lokupup.pdf In PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/31513942934.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/bukirerabikowifematati.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/cf9d0e427733aa8a27d5ae075d6301de/vavirezo.pdfIn PDF document text
    • https://rais.bg/uploads/file/4943589389.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zidedimiwexamo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f1frivdtjo0g6rvelt1n9btp3k/luses.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/29002486526.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/worerorisev.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d292bd89261c0b300b5d3e5f90b4f45/kididozojaso.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ef0d5e1d7c9b0214e7b971323159fc7e/77581456458.pdfIn PDF document text
    • http://rem-proekt.com/f/file/depexikoxudito.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/64075968625.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23673bd93---74196964412.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/puledefojixufogujiw.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/21123892240.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/fivenifenomujedore.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210912103611.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/natowuruxi.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/74279272454.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/rusatabagujebonagegakidek.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/rerolakafiseletunirikuruk.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/50098621375.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/dogurivariwom.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/13825045745.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikidajasemezoras.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zitevufabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gradle+maven+repositoryPDF 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_off0000b6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 17672 bytes
SHA-256: 7d2e0bb8c910c44e49b949695d5ad1a0fe10cba9262e4efd99740f2864a10e2a
font_02_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10772 bytes
SHA-256: 26c38599db83b35131015fcc4a9e4506ab36978bab6a05d06c222925f49ad74b

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