Malicious PDF — malware analysis report

Static analysis result for SHA-256 6857f59b97fe3c44…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 20:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8d166d626bad6af6234e6ee15d5cb88a SHA-1: 8de433d342c203b60ff3c4f04f6a432ba6485e26 SHA-256: 6857f59b97fe3c44686f736ed0b7d75195cd688effd39021278cb3d71a532123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/2d5fb3fba06bb5d2b080e72d026e7c99/kasoso.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/kulabapotuligawibet.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j0ss4su3k4s7ipl2i1t4v6rv76/vuzukoliz.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/93844988591.pdfIn PDF document text
    • http://cga82.com/admin/File/vejiraseta.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fbf50693---71661048176.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/78024330849.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2bc2f4d5---tamowederi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e96f32bee78---nuvizivitobamazepab.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bcab7cfb700b67d531e5260f81e306f6/wagesigadupolisopis.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9c1167a2---fasejuvuve.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mazixiv.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vawigazifisusixabimoxidu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/28497778661.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cuh8vu3aakofomum64v0upsj1q/17525544697.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/pixinezirizuramijused.pdfIn PDF document text
    • https://luminex.pl/upload/file/nawigixus.pdfIn PDF document text
    • https://actorconseil.com/files/file/19513156904.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c04b4ea7f---kazepaxofetefilere.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/565b9ecf619ced9e7277d12150ca87de/sivedulagavagupedipo.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/27872873220.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/gufojar.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/rawud.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/8710019707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=orthostatic+hypotension+testPDF 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 10564 bytes
SHA-256: 46e52e77329d465f08914f5abba546d975b41a2ed4c4369a2b6f7c3797b845f4
font_02_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 15540 bytes
SHA-256: eb74348e5485f5ba405c7b5905c00c155e1f38177d27151577dcce11428e0de0