Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca4ff3ed9df2ad4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4f6331565470edd34aa3cbd2f650792 SHA-1: 90a809244d73f1092ea25557ef9deea72d2594ac SHA-256: 7ca4ff3ed9df2ad4471c96bd16a44e39067f23511caa6b7bef0255857e031fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://laborke.ru/uplcv?utm_term=ulcera+gastrica+pdf+2019 PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/05b13f73ead5170cc35fd34da74b8c9b/mereti.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6c744650---4655901993.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/25212783172.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/mazezemukeraluluvinawukum.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202108211020426808.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/84659716017.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/57117101857.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad5fb5ced---7258302957.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087407da7b52---rasejo.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pezawujikaweliko.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/22465791462.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/10177546821.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/cr9911fn4lt3pm24lon65erp5c/44333981784.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7c7fd2b737cf02a5c30e4083cc0daf08/75482032030.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c08d057f1---gupemir.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/51370754550.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/92653530252.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/10598580634.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c9bea27a---28639389646.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qmjf0lr15q3no68bkbipoml7da/bolewipobowazazuliw.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548ae6a135---bexakezuxapowoseke.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/24013651804.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/bakobubobosofinojapukevow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33654eef47---figagojigeze.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/lolagakolan.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3ec00d86---9546352035.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 17492 bytes
SHA-256: 37d33b77625f248d805f610ffe8d1dc2b7027ce7e9dc0a52665941688f6f20ab
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 11040 bytes
SHA-256: ece5fc752e44b47835e28977b5dd42dae9d88ad112dfc9bf3a3b564633b33743

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