Malicious PDF — malware analysis report

Static analysis result for SHA-256 f218d6f7bc03e804…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 18:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5583a1ea28fe7bca25428c843971a384 SHA-1: dc3c0637773a0ae7d059f12f9a4fb6ebbc3021bb SHA-256: f218d6f7bc03e80469244a546ad9b02f3dbc8a6b186ba9b5ca0017347e1f3534
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=fortnite+top+10+tryhard+skins PDF link annotation
    • http://ippon.lv/uploads/File/94433399467.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/zuxororebasurukonezaxoli.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/zaxolijetuwupelerazuf.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/bonukijelogotedofuvuz.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/gawomomapuse.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wopuxuwiso.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/81320759716.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210919093749176185.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eda477b2---lonoseboxa.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/regewadogobirid.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155c95d7f90b---77787195643.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137703f69c59---pixek.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/10304203233.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/77020260942.pdfIn PDF document text
    • https://o-dance.com/upload/files/17407999023.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b2176404bc1e1ee54381cd061ab72e09/nulutunorusopovunuxokofe.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nagav.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d45b84f0a---faxiresimofob.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/pijedepotebidegomoz.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/2353228292.pdfIn PDF document text
    • http://fkhd.cz/data/img/milezewaranaxinod.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/fepap.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/gududewavirib.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_off0000af0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0A 10800 bytes
SHA-256: 6c2b6cb00cb9be136448b020ddaeb667efc51d4cb40fd197d4543175c92ff501
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 15092 bytes
SHA-256: 305ff8d26a25f6aba1a4f5ae997e65994792287e99248ee61a458bdd71720b7e

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