Malicious PDF — malware analysis report

Static analysis result for SHA-256 59be276e3ac54b74…

MALICIOUS

PDF

84.8 KB Created: 2021-07-17 05:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d087d1a2db103de2fd75384e72ab78a SHA-1: 14b73983593abd8b1c52309392e4655db999ac60 SHA-256: 59be276e3ac54b74186231033a0b92e23c206e5e9bc878da894cda19bb911f37
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5237c416b---15908475827.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2643ecac6b8b2a07718d558898c4401f/38982847794.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb0045903---razitavezonov.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/xeradoberufumuv.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23033528f---59179379944.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa06a6044b---gudepubuwiwasaxukobarudo.pdfIn PDF document text
    • http://riversedgefm.com/files/file/dezega.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/94160179526.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/35131534139.pdfIn PDF document text
    • https://kildevangen.dk/files/nipalalaguvadowozidorera.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/lamafepajevotevar.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/rilunasusuma.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/39959682016.pdfIn PDF document text
    • https://yorapp.it/file/sujivimomoburerofewuk.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/22895277673.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a748048f808---26484226297.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868bfbb8973---14171903333.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/bopaguwizulozikiwape.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609558d5f29a6---57436746108.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/povasivexipuvivexu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16076786dd2d81---3630023679.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pna2242nj45i59irt2aah1u0k0/rukasufewuvajotaziwu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/moloka.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8f327db03594fcc325dc574f5aae23f0/47559341037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=definition+of+s+blockPDF 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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 17864 bytes
SHA-256: 9c107a33932951c87c4bdab47134034a7e1efb49d5fc41f24c869cb16ebe8613
font_01_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 10300 bytes
SHA-256: 0e249d79cdb94fd4eb0c456903881a157183f62b1e64e9f86c43e6f0ede0ae5b
font_02_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1