Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea19f01a99c9b8ec…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 17:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d371426017528bac9d856e32926a9e9 SHA-1: 10159c3aa90377190ca907ad9aa6ad535e731c95 SHA-256: ea19f01a99c9b8ecfcaa3c82211670aa33eb416d6a4af9efab0698393c30effd
176 Risk Score

Malware Insights

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

The PDF employs a common phishing tactic by presenting itself as an image-based lure, as indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=captain+america+civil+war+full+movie+in+telugu+moviezwap PDF link annotation
    • https://baptistfriends.org/media/58953731702.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/50207101475.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pufuk.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rapexaxerubolivenewunila.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/81489314397.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/gobunoduzefosugaj.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/66259490804.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/65338779958.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/41919776165.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/72663069635.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/15107895121.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459f89482da---55949905230.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161401b21bbc46---totekovujej.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4130439349e71a6b2f0e853985813e12/sekebiz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/87a57a86656bcb86f1c6960b3e85b4b7/fimofez.pdfIn PDF document text
    • http://atya.eu/files/file/74982275912.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5a411963---futatizejatisotufa.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mabulobumidexisawivarum.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lutapofedexofizesi.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/84971125401.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/sotubunaxalarigusa.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/1760791111.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_off0000ac5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 14484 bytes
SHA-256: c445b7edd34fece433ee27f3423440f135db343a030467a3304f2155130b890c
font_02_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 11000 bytes
SHA-256: ac4e52a11a5d19d29f15cc243aa49c2faf432dc18c6fcb0cce8cb3abbfaa0b09

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