Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587662f3bc15507…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 09:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aabef2a6841a2b0c11e58f6c4d1e853 SHA-1: fbdc2e6db9e903398f77517347a57fd6fa3ba186 SHA-256: 4587662f3bc15507539b6a92b58eab5953e62b739bfabc823b0418c8c75df7ee
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update, which is a common method for credential theft or malware delivery. The presence of multiple external URLs, many hosted on compromised WordPress sites or disposable domains, further supports a malicious intent. Although no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to exploit user trust and potentially download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=how+to+enable+notification+access PDF link annotation
    • http://ohsongpharm.com/ckfinder/userfiles/files/babuzinixeworikivuve.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613829c2b5a2d---81117057661.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d1a618f110278bb452ba51ac1679027c/38049683088.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kelafodoj.pdfIn PDF document text
    • https://rintrans.com/files/48614471854.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387d242d1fb---vinelivix.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73a670fc5---83608238490.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/47615005665.pdfIn PDF document text
    • https://sitarasign.ir/data/file/95219535427.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fuzebimebakujad.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/99089266769.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/rawowavad.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/68413591535.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/31465493911.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/77305673165.pdfIn PDF document text
    • http://farashimirooz.com/files/75002135850.pdfIn PDF document text
    • http://skia22.ru/pic/file/94636934198.pdfIn PDF document text
    • http://svarovanijelinek.cz/ckfinder/userfiles/files/wemexilulob.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/92143028744.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/jofivirexuso.pdfIn PDF document text
    • http://vuason.vn/upload/files/wufopenijogiwitefifikija.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/nigiredimudura.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b89e82a79f602dd30607c9dd0a8aaf2/tutisapelakanekeloditaxef.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nuwelolilakexusefowolok.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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 18888 bytes
SHA-256: 63cac7a01b1c79c0dfb90b0967d50cb68d8e6aeb57ce9e7aa85537ff94aac21b
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10444 bytes
SHA-256: 07eefaad110e23202772c2be0aa9b750bb45610ebe46c021a8d92742f664ae13
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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