Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aabfa862d72f951…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 16:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a27c0ce3bebbe17fa4061a0e949734a SHA-1: 93156d00c658494b92f346200a31784e1404818a SHA-256: 4aabfa862d72f9512b62cb6d747651d098ae6be8b958d390c240cb3d76e85e08
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=i+love+pdf+dividir+por+tamanho PDF link annotation
    • http://salukool.ee/upload/userfiles/file/nofag.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/ripimevagetuwikibi.pdfIn PDF document text
    • http://retailcop.ca/files/desur.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0bd7ed35---83031955333.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_115607_108.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lakjchibfpvedsou8c0bnv20lv/bobilosazade.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/28805717339.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a24b818a12ecf371826acf7398bad9b/83765062901.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/lekokaluwutidamanu.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/gisedegasobo.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/nevatofixemujujil.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/65735532420.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/58870365089.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a6e2bce9---55644134085.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210818235046.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/11632000843.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45fdd9401---nasupa.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/11649953208.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/wigozewefiwesawizox.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/15a66331e295b3e3cee4e4c9921f7910/zamidusoxurujofidonexiz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867480e14---46536408706.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1354a84a02e9344ec1c150b36a62ebda/biroweverez.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f2c162b---66289859365.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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 17216 bytes
SHA-256: a3d9a795263ae5f26bd83b5bbe60ed2204de9bec49bc5ff05b1502b75dfe7405
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 10612 bytes
SHA-256: bad1692dcc47dfd43ec8f3f54db2a693c7f0b98ecc5dd569d5049fc7fa9e8a09

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