Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8694308ce790d…

MALICIOUS

PDF

121.6 KB Created: 2021-06-28 20:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 987d2d9ee2e06cbc0f10d176b331834b SHA-1: fe41df1bba325f6ab52257f8c54fcbdbda7ef98a SHA-256: 82c8694308ce790d921669e85a4e6ec2b897fcf13f512a15cde3d6a09eacce18
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. The document functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://archism.ru/uplcv?utm_term=availability+heuristic+definition+psychology PDF link annotation
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kphg1kq6tu2o1eegk47f98ecq6/welopukiwidaloginape.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/67952044634.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8985c3ae0696b50dd6d6bf369fe61816/45515135223.pdfIn PDF document text
    • http://cjatkinson.com/userimages/25430330626.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160928a04ce0e3---livotizikivoxomam.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b3d3f4a0---wogazexukevidijomaxila.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/duvinugu.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/2669193375.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/82626830777.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d9499c7c---mosuxafizazo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66cb8417d---8131670856.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5cea87f8b---15851897804.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/49124621da71bf933e72b4bc9a31a57b/mefamitarijonujibosu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b95bf5ea0b6804fd9f78bd11068bd7d/57543075408.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5th7ol2bnvp43r2ek1ua66urm7/18012214953.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607256598391f---99476102879.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7053efb6d00c45ba1c3e3f086ef48833/sodakeviso.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f8a61c7f074488b5cd79c18896c24b36/51396332378.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac93925d7a---migibozabokatazaropopom.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jogadoxopixatoxafupu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/86a7230d87b36a857365ffcb30043318/pewudizedixobesegepapida.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdfIn PDF document text
    • http://ubest.ru/images/file/56158119518.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rurosijolexo.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_off0001763f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763F 17772 bytes
SHA-256: 3afad21df921119d46123e44d60aa191dcd2f4a3db1762a09c8ce4d9a8dbffd6
font_01_sfnt_off0001a4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCD7 11300 bytes
SHA-256: 1d3328bcce1e3fd6951de4914609ea4ec1ceab72afbfc4a82f2982124fb6959e

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