Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4eb955e4794812…

MALICIOUS

PDF

89.3 KB Created: 2021-08-23 12:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a26abee269831f5370f3cba847cb098 SHA-1: c1d68ffa6622cd0b6275b7048ce2ae3979a68796 SHA-256: 4c4eb955e479481247bfa9141732e0e923506dc38f778627814292d999eec2b0
196 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, with heuristics indicating it is a link farm and a browser extension installation lure. While no scripts were directly extracted, the nature of the lure suggests an attempt to trick the user into downloading and executing a malicious payload, likely leveraging embedded JavaScript or exploiting a PDF vulnerability for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://mn-print.ru/ckfinder/userfiles/files/73546557322.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///zuzuvirimogeselu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608374d81331f---verovuriwe.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ceec39fc6494d995b9ba0a8964f26a4b/dukorizedonepiruka.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/merin.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/87850756004.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9aa9596f6---nejopixetodexato.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/22f3d2c31719ab98b10393637ec79541/riwizak.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/tatenajesutuzijuga.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08ddb948---zosuripudotaw.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2c5ec36d---56324457704.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/jagudovapise.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783bfddbc3e---modenademuzovimusesop.pdfIn PDF document text
    • http://yuha.be/_files/file/gibizewej.pdfIn PDF document text
    • https://tcremich.lu/files/files/bawukovu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d51bea318983fe375dda6c595443b851/dezepubiwupapozosi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/4664749474.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/feed881f418d390e5d02ad4d62ac58a2/22521330830.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d691534504---repoxabaluxibezuku.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/rogopalok.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e46c71c5e41cd4a9769370f72028dcd4/20150262791.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vmkr7isu70u7qu098bip0ic3dp/65783614434.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e7aaa1d587b99f46d9fde12e97692700/6431369483.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/rirupebomitobat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=access+westside+family+health+centerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 18516 bytes
SHA-256: a868129d7366aebd13da31774ed6f9a37d9783de40103bdbd07f35c5ef095e43
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 10804 bytes
SHA-256: b0bcbdce58d9ee0d8ffe70500386f9f2a59e033a645e99d9d8f3f9ea802a2ba4
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489

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