Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53e053962e96dfe…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 23:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a78d02a4c0a0470dd2bcd2e4c2416c3 SHA-1: 991c92e6b9a06ede4e40be6a1457f1bc78a1445f SHA-256: f53e053962e96dfe1c4662bec982097d06befd455843e8f995b2e52137c09e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=critical+care+ultrasound+book+pdf PDF link annotation
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/92a49a9bc9faddc28237c7075dcf52b3/15039068574.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwapalu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///20968755127.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/puninadopidukupivuf.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/76275850116.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210622232408.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/befitelupewawugopo.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/56966429557.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/62299094946.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/18081306272.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/doxinotimosu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jixenikabep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e3cd283a---runonuwives.pdfIn PDF document text
    • https://egf.tw/test2/images/file/89322224989.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075781a28103---27122364225.pdfIn PDF document text
    • http://htwy.com/upload/file/23021946377.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/76236679359.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c9235f6---30202358836.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nilufedag.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kajaxozurikuvapupuluv.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/aaf422035cda27a5ff6f7bc38b7c90f0/16387587012.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e45ca23434adde69425e83e1c58d1904/mizilex.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/zogek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073000a1a56d---52340753838.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_off0000b7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 10976 bytes
SHA-256: 1ec270e64d30a779a5c8fbdc70c29eaf3bfc25b46d3a78ae4f493c3800d4731c
font_01_sfnt_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 16140 bytes
SHA-256: e24267c0c532935b595c89f7214cbd23cc5e9d9a4c663f9c35d9f03524fedc6a
font_02_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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