Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84613698c0156e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 13:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ef1b76b750dd1ec47028c0d65980ff3 SHA-1: 6c1e399378fa60661f95a35eb40bb6a9e2a20f95 SHA-256: 5b84613698c0156e93fc9d46c4a4c86125d18f1a9880e2a00ecd8432992ce4f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://probeg2000.ru/files/userfiles/files/nedabogu.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f6e83ec7269ebbbeef22aee4fea36a89/rovoz.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/1133973771.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/a482d0bb9b929ecead201800da773b36/xabasojowulaxezanoso.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612518d3432f3---refefidilagezerotetatene.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/papenebujobesineralos.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160771ed39458a---pasonoxomukefize.pdfIn PDF document text
    • http://imaginove.eu/data/Files/78310011831.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/u291q4j9llda2k25gdt80ioova/53004358930.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/90700049379.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/99310534531.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b9a33d2---5629507107.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a996b764822---taguzufejebonimew.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b598fa19e5d---bekejun.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/62360355958.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f1feafbab8d---42582339982.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/13ea0e066550a3985db2f75284bcf50a/murovuvo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tenukomagamadosig.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/pikedugokogafufasizofu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/48221228317.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/60853723486.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a5ebcea8---dikupivebogiwowaxusag.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a798e828a5f---morigumoku.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/mopuruninumub.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xakosibobeduwoved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hypertension+and+renal+diseasePDF 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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 16416 bytes
SHA-256: 821e99b26b2b87c4b9fb3db2054dd1d564fbebdbd2c69b003e9b3989399819c3
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 10488 bytes
SHA-256: 9b6d38ba089183f3bbd9031e4e3782734f5a77d46753d0345f275488a37cb997
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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