Malicious PDF — malware analysis report

Static analysis result for SHA-256 a782a878e8590888…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 15:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13f8c01781c98b75d05fe05d98a55082 SHA-1: a9ac89e64ad0250a0a1536f84e3f962ac1e898a3 SHA-256: a782a878e8590888656ec8ef9a6c383de97bd4af285dd12a8320549d8f76ad6b
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update. The embedded URLs and link farms suggest the document is designed to redirect users to compromised websites or download further malicious content, potentially exploiting vulnerabilities or delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=different+emoji+copy+and+paste PDF link annotation
    • http://artechq8.com/beta/uploads/files/wazazafatatevivalefaxi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4cd25ad---25968184256.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495940fd7d---kugetan.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062fb300d0---63657105519.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/sakidodegabikesogibebuno.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb27a45359---nozupimewupape.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19602664052.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/850dfef7e7af8a67848261474a34d2aa/naxavenesupubet.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/turesonobomowo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/83094146456.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/bixogetifapinakinekuga.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/43436818102.pdfIn PDF document text
    • http://envigest.cz/upload/file/dozibo.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/58293088123.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/livasapepemixuk.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ridek.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613679c7d835d---83212184673.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/sagewovibupojebodivemejal.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/milebilowipa.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/mokaw.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/ramitij.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/61386790007.pdfIn PDF document text
    • https://maviet.vn/upload/files/21891428214.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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16880 bytes
SHA-256: 8c368a0f06b5e3b10e8d1595b932076d6444b460adfbd23c5298a855988d1426
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 10980 bytes
SHA-256: 11e67173fbb8dad6f091d1b65adf3b9c60ae79071ba7567b088c65c057a8ad50

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