Malicious PDF — malware analysis report

Static analysis result for SHA-256 1903b8d4e38dca13…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 22:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 921172571cd55a67d3b08652a26daa75 SHA-1: d5116871cbd0e2d84f19b116569ddf9ebaf46d37 SHA-256: 1903b8d4e38dca13e3d00c340a42669f3e6bba696d01a3dcb0f3bda22f462aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=sentence+that+has+subject+and+predicate PDF link annotation
    • https://bazab.ru/ckfinder/userfiles/files/volewaxititofaneminogi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9543458a---mexofigosexisamimewob.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/busevadexabaramalupak.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/35847182739.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dixivejurebakokanajuv.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/medanejumobenerore.pdfIn PDF document text
    • http://planetamama.ru/files/file/14111520529.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b624f30d4---12311101977.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0837cbe26ec6fa10a402fbf47e680131/pozodugetutobiri.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/loberuwofuruzinijekevoj.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/nirofodowepowuwisigukew.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bad865d4928---towedepu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c0a8457a---fipopupifuja.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c0a1bbae---46335043160.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fubobudepomugoremowewa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608257599c804---pusafowuvosinu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tesefatekukizipipubig.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/venegavizimur.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9c583edcd601fb6f698ab149485fde71/22893367807.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/7557537484.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae62d1d0c0---zulixilutepal.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076316488603---fewixanul.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/52868952183.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10888 bytes
SHA-256: 618bd90a1dba087f152302d0d4827ad4b2634f3479550b9a3cc7ea11e8d44844
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 16604 bytes
SHA-256: 6be8c0224f3f319c738ac935c8d3dbefa822e62e98451102c1b20bd35dcb1f65

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