Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ee24e97bf5dc25…

MALICIOUS

PDF

82.5 KB Created: 2021-07-24 07:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 208620a06327cd9cdf266f81abc5eac0 SHA-1: 38796d7147854f2e7cd93317510402c12dde4d8e SHA-256: 66ee24e97bf5dc256b68c83b4321b94039a55b34df8caee228339ef9d3c9be9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608945dfb370f---joluxijivip.pdf In PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/15240304207.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c646af0b---muziximegedegunabew.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mis36gl2u583ibqkhnsrtcm64g/87837322402.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d2a69444---96979449256.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/lerifowofujisa.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/94168759175.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607715d39b793---97135611255.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740257b0bee---19433930748.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/zuzozeruxexumexopigububil.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/savasubulowupipuwus.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fce49d68bcdb87cf7fe0d740cbd7c925/kifimeteruzefi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/47443751572.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c993cf55795---pinaw.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/wunosigoda.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623897735.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/fegozumep.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/xinud.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vg6cs9tkv95i6a095j6ik9pq7e/88124316257.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/89777769175.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/ribipanufasev.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/kupiwiguvijuviwif.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a04dc312f316609b3bff81f9bf069524/gejafexonusobasab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=family+guy+the+quest+for+stuff+hack+bluestacksPDF 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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 17080 bytes
SHA-256: f5788f48cb19a694a78993284970b094cfaf7bb3897f892ab7b0d5bca1bf5318
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 11248 bytes
SHA-256: 7bfe6431e3bc44deca1735e8af709d82aac628f44620bc8e236e641c7f20adbd

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