Malicious PDF — malware analysis report

Static analysis result for SHA-256 d431f80173b556e5…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 12:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a4e74d416cca3bcfed84f50ab218ba4 SHA-1: 05791aa927bbdd63f3ed0213141a448b0fd571b1 SHA-256: d431f80173b556e5e0387960f38bebbd2ddbf588e2f1ab47446f216c618c7018
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised CMS platforms. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's intent is to socially engineer the user into installing a malicious browser extension or update. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of further payloads via the embedded JavaScript or linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=9xmovies+download+300mb PDF link annotation
    • https://cantellodetersiviprofessionali.it/uploads/file/49697912013.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/33437474566.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rarilewojikowakigisebanon.pdfIn PDF document text
    • http://ipublicity.cz/data/file/84951202123.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/47879412881.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7567f99508dcae18c41e2ec484819052/kofago.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ad6f4d5---xasikotox.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/ragomubibuzete.pdfIn PDF document text
    • http://uchid.com/uploads/file/lasem.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/4935254138.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/37103225500.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/zojabuxodameloxuparakoni.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/44651899103.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14388929120.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/25600838066.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijigujewun.pdfIn PDF document text
    • http://hkwwta.org/userfiles/lazegoxarilufosojev.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9d72ed85---nisujej.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/83723776395.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a186d9de9---tasipupodekibabonowe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613942e08cd04---31733797673.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/wutesanodabeg.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/raleraninazorowibagugijex.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9145690a51116b2cadf189ffbae16b9c/92077315597.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/91711768403.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/eb7610bea61e0d80d21353fbf8ad727b/kibomi.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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 17404 bytes
SHA-256: 2ec43b0d71c49c22a9c13caf2a5987c3236d23161c040cf005dd7b18ef043643
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 10972 bytes
SHA-256: d5bab8bd58c591fdc85f6db3dbe8d30913599248ba96f43de9a17bc8a09796ca

Open this report in the interactive analyzer, or submit your own file for analysis.