Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e7fbb24076ddc7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 06:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a68106e09225c24d48a86a9b6e9c6bcc SHA-1: fc82136e7e769f1f48e4ebea0e952890ecc24e6a SHA-256: 27e7fbb24076ddc70724a2142ba62db5c2207b626b33a71d4f84562f74b8c527
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yellowmangocafe.com/userfiles/file/38553526862.pdf In PDF document text
    • https://emenu.hu/editor_up/batogokesaledumesuxabi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f406b4f40545277b7a7c7df603822ab/jepipitogogafigo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8435751adf8f462ddc35538575aa9047/gagoxumeveti.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/77910747538.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/tuzuwemojuxinewa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131261a85d52---gisuwovisokunijavo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/60262252743.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bikigelulemebe.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630870494.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/4382675940.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/zegezibulutapox.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50390146696.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/92533146161.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jopenuvenivuvujalugasog.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/gigapakofetawaf.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/94381681079.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/wawojepelenifipupi.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nirepaxajibiwud.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/78482853334.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zatiguvarolisawibide.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/82718597989.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/75292143042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=while+you+were+sleeping+filmPDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 10840 bytes
SHA-256: cf7b47047d826098d5da3482ca5f806d04938f4edb228ae70dd302de3270771f
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 16064 bytes
SHA-256: d3e179f35d75271d997ce131c9f1d8d29ece240478a1801ef686ce5018ce758c
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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