Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f54c36b703f4eac…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d78106f07c2576b4f299cb5627e2599 SHA-1: 4d929ee1bda87c5f69891afad58898a203a25d25 SHA-256: 7f54c36b703f4eace4f19d6316f8f2e9a1ab68de3f5710673d837d011a29e8d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=biggest+size+app+on+play+store, are likely used to distribute phishing content or further malware payloads. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external resources.

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 https://nomylo.ru/uplcv?utm_term=biggest+size+app+on+play+store PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161366cb642863---38809471656.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/27828017612.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb079e3bc---kexewotalus.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/1478671464.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/gumusujinojogofujiga.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/37130762519.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/94417965714.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/66329998764.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xipuvenofin.pdfIn PDF document text
    • http://etre-belle.su/images/file/dozefidifavase.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d591340b3f---lunenedevamazoxamijiva.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1ce2e8352faf4ddc149ff36dbd5559a6/92549460034.pdfIn PDF document text
    • http://ore-processing.ru/d/files/68308183746.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/34933140666.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51270664554.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070547537405.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0k87ebv21j3cl9gjgc4nl1r3pt/tabilugunet.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/jakag.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/gesekelofagatofanovez.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911100425338019.pdfIn PDF document text
    • http://hjhchem.com/upload/files/muzakuxozuzubi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/53188809268.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631292807.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/noworipemoreroreroxafe.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 19792 bytes
SHA-256: 214d48ec35f1bf58b1c8b8f817303c95eaebe2154d797737f45f0c5730bb0b9e
font_02_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 10656 bytes
SHA-256: 007218c6e11f9fb0e3c62c7c06b004921b77c3136be5d97333542d02b28ec605

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