Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6784585b57fbfba…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 15:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 72a1a86d6f5f8d9ea2cc20a05f048145 SHA-1: f412a487761f4cc41df142e0954e2be960913674 SHA-256: a6784585b57fbfba3d0b1f815de31b530219ac48087fb505f8936bedaa9d479e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://paeonia.ch/userfiles/files/mejamuvaxinok.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2n9bu87cmrq4mjdpqbvntqo1l7/60660108863.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/42675959931.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/19524998510.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/17971206307.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/puput.pdfIn PDF document text
    • http://baoveantam.org/upload/files/jivenev.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/10837960947.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/29ef166130ef399308a579d27f4ff87c/56360805510.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/famafipulexugijosumugego.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/10019168665.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090634427_678993261.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/kopexugemejetedudugovifud.pdfIn PDF document text
    • http://szhlfz.net/upload/popoluzebawifikife.pdfIn PDF document text
    • http://sdds.be/userfiles/file/87220040914.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/sadisidukugobitupodabibep.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///konafuwutigazeb.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b4deaa1ee294cbce7824183cd095f6e6/tibalawa.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/xabuvito.pdfIn PDF document text
    • https://andana.us/files/files/83819489371.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133144b6546d---39456805887.pdfIn PDF document text
    • http://minerva-collection.net/files/files/weladifepafozur.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/tufakedokudatimo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613229748057f---muxumegisox.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/kimobinojalex.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/3011656896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cost+accounting+formulas+pdfPDF 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_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 10964 bytes
SHA-256: be1fb912f3dcad34bc889afd35fbbe554eddee4d2930f55f2540a12162d28562
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 17848 bytes
SHA-256: 8fc30c6f2ba8c4260cd4acbc8c6b9f1fc01b1e8995ea898d50814c481b7d1e0c
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1