Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50cb4a7169d51dc…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 05:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 140b3f7340180d4db816d4412155c018 SHA-1: f3209beac327cb21b61b834ef9e302e97845d7fa SHA-256: e50cb4a7169d51dc7a7c38c380ba9d3600368590a825af4527b3062cfdcb57f8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive invoice or payment request, intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oniceh.ru/uplcv?utm_term=tax+deductions+for+single+filers PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7076def1c4---mobaranumas.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/firifaremefiwepe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1a6024cd---23993094445.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d76cda16efbe04eaf7acb9595ce0d3c3/84031768164.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/73265411372.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vixawabiwiruxegawunumige.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/wodaguvapimudinijesav.pdfIn PDF document text
    • http://polkovnik.su/upload/file/gabizopiwugilabofajigid.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/paloxexawerod.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/42091673182.pdfIn PDF document text
    • http://fabtur.ru/upload/files/85116954939.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/78362503592.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b4571907---sujolovo.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/levoperimevotak.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/93100654986.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b2c3201ae410675e20fb333290e3a938/74671223578.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/58e82ae7bfd2e4a2e2610d7e9b012154/4655070031.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/56199758445.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/87mceismsjqom9u8bbeg5vvs90/gelolejobapepo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83da9f9ee---dutakomajezoled.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/31046446502.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/gikakudujanizamiz.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.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_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 19076 bytes
SHA-256: 75c34dfabd2c1bd31c6f893ee79bb622b35896c39977844bfb87d8e29326a3b5
font_01_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 10816 bytes
SHA-256: 9c91b3302f2ba53860d42674b50594b9cd65ad1a84f6132429377ff12bf563f2

Open this report in the interactive analyzer, or submit your own file for analysis.