Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e7b34e7bc1c8a5…

MALICIOUS

PDF

79.3 KB Created: 2021-08-26 11:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f85a4a2bf6ad60b9d8fbab67587d337 SHA-1: d3e9abbb0e7632f508363b1c2fdb18d2d2b15a1f SHA-256: 40e7b34e7bc1c8a53a01932403393b70f77855204b279e15f3ab1466ff1a9ac8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous links on disposable hosting further suggests a malicious intent to distribute or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3e215f28c140021b21f0bffbd579ad4/26776900471.pdf In PDF document text
    • http://premium-h.info/files/files/jisutokuwaxabevurorediti.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/17744899633.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/93c79e98db3011b073d863ea24622193/wanebazuzorera.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kotimixazekenupi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/538afb86a848e140e0df70b493edd0fb/97935962399.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/6151734257.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948930214ee---18818081024.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609440fd13984---varufoxi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086619c597cd---78451782323.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c5002131d8---78638759798.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vepujamexa.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://offerparts.com/upload/files/79763455658.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c29dd8f69---12317379923.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28601088001.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/fadafodasukazilajetisovu.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/9972158131.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/todisuvemafefuxixilunevux.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/nofiletepakewezovabo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af87d20c655---38923349731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gay+glory+holepornPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10324 bytes
SHA-256: f92c6cb3339cfc588c2753b8854b9c9c675bbf722e391d3adec6abe7bba16f23
font_01_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 16148 bytes
SHA-256: f392eab073e6d76695f0ddfdc0b5dbbe299d614045a98eaa2bec09b2c38652ed
font_02_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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