Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd69025186c0e99f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 12:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cabefe05745fa7e3c5d723874bbd1771 SHA-1: 9ae9ddca47902fc5def1548c5d6cd4f941f36468 SHA-256: cd69025186c0e99f73548730228566bc5bd9702afd44fc73dfafc390803f885a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs are likely part of this distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=best+android+football+games+offline PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca1d37402---nutozaponojapapudojavo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/rejaxexuvodowulegisaluran.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/74800750418.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e7c98dd4---88577296021.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614483ec64a99---folorajiwateledaxuw.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429eeb27b94---xewinoporilisalo.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/wigona.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/96727926457.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b124aa7dfb55cceb8f8866575e93cbd9/kidamudemitusatokifaxe.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/78480839617.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/43058208685.pdfIn PDF document text
    • https://chp-travel.ir/data/file/94528061853.pdfIn PDF document text
    • http://villkasz.hu/editor_up/24255577535.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/71548086092.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/59957165000.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/pojezubevim.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/67622279542.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/kavifuk.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sodilekalomaleta.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/lusagijowerimid.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/83300191388.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148953a52206---38678543424.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/vosawoparixesef.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 17976 bytes
SHA-256: e0994406272d7692d1cc8552e7100712eb92ab0da73204aeb2b1f6f2d72d464b
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10888 bytes
SHA-256: dde159f93f214e95c40c453a1fee81a6eae0dd5c0a9b3637bcc7d0fa0826a82c
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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