Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f044786525c5d0…

MALICIOUS

PDF

86.2 KB Created: 2021-07-06 20:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2b2db432c53b1b6096de4130286a50c SHA-1: 6161d6c8436d737c56a2830c9ffc0598f424f955 SHA-256: f8f044786525c5d0af908ebb0ee0be9996fe2c7ecb9dcaaf0c017be20dee7322
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. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, suggesting an attempt to deliver a second-stage payload or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607875872db6f---mabowusumo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76600e38a---35803125940.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/77266673993.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/moxisanedezuda.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210617_87B47911B0683679.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0263d26f---59999191920.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/11b5d0bed96e21362c5fe6b6c8b43067/rikigipuwujulubagu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/77472044011.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/bodujile.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971fa877834---75204980433.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/76069728256.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24565068900.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2b3a3745---16384626717.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/61912713731.pdfIn PDF document text
    • http://goldmustang.com/files/files/gemanozanin.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/63664943078.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/ropatosuva.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/73bcabcd3dc68552553a6cc16d2ee799/nafigobusijejujuf.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf496cad12d---wupimotazosegodubapin.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f11cbd546---18697124082.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/92418005546.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5gdki4p7q291lhml2k4d9v1v9d/75034036908.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/dodona.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086175e12500---73911202612.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1f6b471c---34739121786.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89584577989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=most+touchdowns+by+quarterbackPDF 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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16904 bytes
SHA-256: 13f82321ff1e96283034b5bb5b81c3f904552ac9390362d8636b7f2e4b0d3d58
font_01_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 11000 bytes
SHA-256: 67d2bba86320ce838147a3eb01545cdac28ae423f2f9537a1c4ae01af7974401

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