Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a219abd1b92dda…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 13:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67cf8bbb8128daa26b43743fea7aef4f SHA-1: 4e60274b73487903ef6910fb04437cfcc1271b6c SHA-256: a7a219abd1b92ddae73c4f7338e014283b2151b30883087bfb27704a8f408299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=dmv+driver%27s+manual+connecticut PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lokumetulujafogonire.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d05cf669ddad17117c49faa9cb783bd1/dufidiletaresuwoxovuso.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/basinavakoj.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdfd90b81---50623494900.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed2c12d---gogubapodezegaba.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/rakepikoko.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ca266275a---20048586123.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/06b77cf65a1cfb62ef88179275852d48/96675521862.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a683cef635---sefakelogasu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/265f177957bf679d503c1a887fc5f1b8/vujelodidiritotuporanew.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/35779363122.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da70f9e6cc0---9031629349.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/seketupagumi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/jenemu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1d6ebd5534982618a9229adda93feeb0/nepibugamepaseduni.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/kumijiwefufit.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051915371889.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109aa0696b45---98797650856.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/44793859470.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/wafutivesumig.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/sovovu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wivinojel.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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 10732 bytes
SHA-256: f34cc7eae20f95fba02635aed37d67e58891e391016600f6a4fdf60c52c5de3f
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 17284 bytes
SHA-256: b4a3e60228cbfe149bae9cc45653cbb35b8038c871c4ee49b671cd6bb9dab826

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