Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c69e2c19ad2d28…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 02:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e319e5c319b1bbf53f1422ee966e055 SHA-1: b738065aa77d422088449209a14a5b7ec5a8fb35 SHA-256: 38c69e2c19ad2d28e4cba2fec7efa638686744115cedea61448b0a35c8d2ea2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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 http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/govuvokogusijal.pdf In PDF document text
    • http://www.pilatesyoga.hr/files/files/mipujagase.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/98405904526.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/jubazevofexisixazuzevo.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/munexisoroxidew.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrupnguguv59g77cquivasnk05/52481537239.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/16059782827.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/liviruferolixasib.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/54778707300.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/55327598005.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bibowobavuxipej.pdfIn PDF document text
    • https://olterus.net/contents/files/26711852108.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917142001.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/24000794777.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/95617197539.pdfIn PDF document text
    • http://hiniceshine.com/upload/93230641085.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bamonadakodekawunukabemo.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/84608260744.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b4766db2---fabiduvijepimuk.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zirazu.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/77379984562.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tozuforifigarajofuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+vbucks+for+free+fortnitePDF 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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 16904 bytes
SHA-256: c7090c816bdd877788da63bb21b3b9c18805792457153ef57b29ec86c94b6fd7
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10780 bytes
SHA-256: bb072b2e5b066abc400d97a704c3471b0d2292320780bdc581800f49d1b137ab
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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