Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7c458dbb578462…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 14:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e5aee1a293d9c0a86ad11535e2a2280 SHA-1: 32034be7b2eca15ce77da2f49a23b78c851960c3 SHA-256: 4f7c458dbb5784621c9995d42a78ddf0f43fe20fa4d4998dab6b8e8c04a756f0
236 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering tactic to prompt the user to install a browser extension or update. This, combined with the numerous external URLs, suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall pattern points to a malicious PDF designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=transformar+tu+android+en+iphone PDF link annotation
    • https://pensiuneavalentina.ro/app/webroot/file/8125649012.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc877c571---gazivasojuxelab.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf135a463---665805171.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78599485879.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pexazugefebofikiratubolod.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xefonijulese.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/41221902774.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/padasakaxejed.pdfIn PDF document text
    • http://stonebreaker.at/72297938783.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/wazodifolinowevafosatiw.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/16006620308.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145298b5bfc1---bekizuxunipawip.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/vaselaverurowa.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/95935439904.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/fobamo.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/natono.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zotiresodofalokeraveb.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/64080018085.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/11743415710.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5fab7d7e---14184530877.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/gebulumevozesexorif.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/julawebexowanewew.pdfIn PDF document text
    • https://fptica.ru/images/file/85507597065.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/disivuleruda.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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 18884 bytes
SHA-256: 4b90d1f6d1b19ac4506392a38f3d7831e9f745d5d9f8fae14e6f86eb1d86441c
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10780 bytes
SHA-256: 6064b64e8a6a323c88fccec57461524a2a7df7c938a2b8330f90ac646344153d
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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