Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d22544d56539181…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 18:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f49e69f90086431e80bdc038883c589 SHA-1: 9821cef2966dd9edb8f3691d80e6632aa1f64e84 SHA-256: 2d22544d565391811c7ebc37a34e4fd874f23874a2e842473dfebabc9571b591
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites and potentially compromised CMS uploads. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=glitter+live+wallpaper+apk', are likely used to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=glitter+live+wallpaper+apk PDF link annotation
    • http://maimungkorn.com/UserFiles/file/kajifivurebume.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nodezalofekoxopovugidofej.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/25707455027.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/latel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e97a8a826---bilurefilexiginadibimoxan.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/vipizebewurinax.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xogonu.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/70952416764.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab8543f4a---ropaj.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/palav.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6hbp5t3taierrnee94ng96sm24/gubezonizu.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/foranezesevejetizotage.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/63332049326.pdfIn PDF document text
    • http://precisao.net/files/files/mezosib.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a383adb523---43897005816.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16141388366425---5143133759.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ahhqq889jlrbr558c29huffmlm/pitug.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/nekagitu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/matuv.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/1782672212.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7f557698619d08d1699efe196fdb9c70/vilotunemudosixob.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/mugizawupuzafavo.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 10136 bytes
SHA-256: 1e4c52ed6948fc519a4c2bb417bc8f142d3d21cffd47ed2571d714f1b9c42a2b
font_02_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 17296 bytes
SHA-256: 2a81115b5c5b2412af71addf1db93799a7d91b3f54d20992ee3e86910c1b17db

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