Malicious PDF — malware analysis report

Static analysis result for SHA-256 324f9482e2fc58fa…

MALICIOUS

PDF

96.7 KB Created: 2021-06-28 18:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6ef60c7ca0d9af641b74ced79c0267b SHA-1: 74b32f3d4c10990bded74dd1bcc232274526ad7b SHA-256: 324f9482e2fc58fa82a2092b542db2317ce278b3f745a007e00a7e7795c0fb37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of numerous unknown URLs associated with compromised CMS uploads supports the conclusion that this file is part of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d344ab772fb---pomeriwezekenedi.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ec867f8af990ef5402f681d9e1e66067/93692564700.pdfIn PDF document text
    • https://defaico.com/d/files/46947777416.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386ffc7ed5---62235104057.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fozibokemunewotigig.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b0b68c4c9699a8c147844c7cb0c9e0a1/6221520050.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e388d40d741f80fc9b06283f7247674a/kusurokuwi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/nixixeraxeled.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/960b70c3bcc8f17ed1e92b141338ed8d/pupozoponajut.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d498bed9f4a---23062025833.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210614225300_ocvtpz.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/mezulolukedowemipomu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074892b4ec99---61080573259.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/dcf419aa4359531b8d9ac2cb8f6487b6/kovusewawadajon.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/86497473918.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc572233df---davabuxikimid.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ced76889g732lgc1u95d47gl10/vinawiriworodovefu.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/28839495696.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/31006538944.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f354701da---87896353474.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/donumofovusivavu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c982192427a---birodegujujoroxezekoju.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf1097bf2---jabomovatikumizubozowure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+appetizer+to+take+to+a+partyPDF 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_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 17128 bytes
SHA-256: e4749067ad6028def6238402ff6190cca3a68280130fe1d122090da8b4fd9c28
font_01_sfnt_off00014590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14590 10416 bytes
SHA-256: 99a3a438d640b009453b2138889d6a37142f532c455feebaa74e5c4200613a23
font_02_sfnt_off00015d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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