Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2d2576456e1182…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 16:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e378fb0d36aac7f7445c36e97d3fe10 SHA-1: 303fdf7b26885ef73d5ef9fe3315250eedacf82f SHA-256: eb2d2576456e118278c9f57c6fa5f222c0b8190ef158273350e991f8c86c390f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The embedded JavaScript stream, though not fully analyzed due to its nature, likely contributes to the redirection or obfuscation of these links. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://33podarka.ru/pictures/files/zinikopipikisetivesawela.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/6378105839.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/vuzegenu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o21qkvkbtdvq41b7vmufj606r/zunizudavufonilonupinitok.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/betobofaki.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/dijeduwekimafefejalarowox.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361fa727663---raxanukoli.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/sazadepapefivetiruf.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513c982674---zavonusexujo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/i2udbsor11881t663ug6gn6gr6/89918912257.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/gavixazukugiripewupop.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399401dcbc9---ditimezefozasiseripu.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/33212214711.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/37829086478.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lusuwemofa.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/mogizudemumutud.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/rozajizivupewe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/lalezolovibakojakik.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/3029157475.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/90786397641.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/barorolomaduki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+can+i+make+my+android+phone+louderPDF 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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 18920 bytes
SHA-256: 40a024ef4f5cbf661bb750c154e049ca1c57a807d40e0023eafe7a7a3bb097cf
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 10896 bytes
SHA-256: 6da5cecc8afdfb8be52a00e0bf0e35ce0e2ac237c837a60683e62d166acd175e

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