Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc14393dab6c7aad…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 11:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 693a044c6cb9a994391e244e76d83122 SHA-1: e3cc56ac51388ed9599e45f51420c58570821ddb SHA-256: bc14393dab6c7aad7009f780b1c5ab0b9807fd86d72dc89a324264056c73fad6
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further indicates a deceptive intent, likely to trick users into clicking these links. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dintek.eu/uploads/file/zitojusinalugap.pdf In PDF document text
    • https://burgaseguros.com/userfiles/file/18719339375.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/tisexunir.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/15c0cf537ccd355f7d1012774f58b500/94940615283.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b03de99b9---38739789859.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16096d591632fc---sazaredexunokakopifumi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jht66k8dnr816tb95vb4e4lh8j/94327173982.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b369417c9---juzuguzup.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/92305902900.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd9436fb---17124921063.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffa80c54c---vadat.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/35468745218.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1b466ac8e1f551cb01fa265ea73416ac/retomunuzonuki.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/wexujilovunobuw.pdfIn PDF document text
    • http://alltechsro.cz/files/52501172665.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/86745707678.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c812e49e---46893616817.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qa6hove2ervv5e4bp2jb03uue5/30483716708.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b75811f86---29903189430.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/11039275107.pdfIn PDF document text
    • http://mextro.de/upload/files/gefuvaramupunevep.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gukevubaja.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c3420560e381043e2c4bd5a157553a9a/domironokixumunu.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/sifoxosatugaju.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/79187568641.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/10336473711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=floating+shelves+plans+pdfPDF 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 17840 bytes
SHA-256: e5f8831b66be98dceb844560ddb7c4ba465477dd2bdd25d6f6c91c620f5dc77a
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 10720 bytes
SHA-256: 00167f58bf6a0757d0dd769a20983e041a77d2adba29287f3e18b53cb73bd633

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