Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfe57b078f3ff9e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 07:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87c6e05f1aacc2665a673cb2983f4064 SHA-1: 75600cec78b421e6975d488b85580e2e0414de11 SHA-256: 7dfe57b078f3ff9e8c87cce52bc7c428bf50476ebc6eb77cae50bf7db6544780
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering by prompting the user to install a browser extension or update. The embedded URLs and link farms point to various compromised WordPress sites, likely serving as download locations for malicious payloads or phishing pages. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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://cructi.ru/uplcv?utm_term=can+u+see+who+views+your+profile+on+instagram PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141add73923d---88079815230.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a7848d8ce72ad92c4b4851b1c3578ffb/89928455292.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15950fe77---97483894140.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/gujojurerutabebefubo.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/tatokikalivotisir.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/lonudipi.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/99233838247.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/mujukakazexelemuju.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/50346187838.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/sevikuwetefinugazi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/65770868485.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zawewosuvetod.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fifitefetomeredizazi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614270a352a76---27225747440.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f2c1d43e36576ea176bdda04d0ad42f/25038878229.pdfIn PDF document text
    • https://simorgh.it/uploads/file/dizupimetubusevadu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/desavokufe.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gewavox.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitavafitirekidu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/17559623761.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/16411937684.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136de7ac1705---58638172234.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/55303449488.pdfIn PDF document text
    • http://vhz.cz/user-files/betikopobokanavaxe.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210910_90B16932421F1019.pdfIn PDF document text
    • https://sanagustin.cl/files/pobiwixexafopavibisewos.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161450d1e6ebcf---838812795.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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 18200 bytes
SHA-256: 19755d791c8001b5cd53c1940b3af5acde016477de2ca1f1739e8c54710b2289
font_01_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 11200 bytes
SHA-256: 478107e116544412feaa6e97f104222fbfb5c0574bbcfef66dfc67cb6641726f
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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