Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57a6f4bbf8e2c3f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 21:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26b33f30b6af17b1bec29d86ed0b0f01 SHA-1: 188d14637e527bb16f5f8eceda522b30b393f65d SHA-256: f57a6f4bbf8e2c3f1a8e88f759dd580f16782a75a38f3fad01bc12be41b21d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the links and the detection suggests a phishing or scam attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.deopendeur.org/imgUser/file/16105273934.pdf In PDF document text
    • http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fepevonajotapaduwekegut.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/57989162044.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/89094651740.pdfIn PDF document text
    • http://bushurov.ru/images/files/27827931136.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/dugagebetogutimojenowa.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/23621542155.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/82967923800.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/nifobotixuraxede.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/90168747494.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/37514180525.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/52557861604.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b81bc961f5e8e0f3827908ff7cdbd2fd/44530924512.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/16679837440.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614258d474f65---79486527434.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/53104147653.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/tosedemuzeta.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/47474319554.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305538041727160916.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/50517444231.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210910_9BADAD9E2733C5E1.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161367694b3d58---buzubazadepazak.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93815363851.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/magedoremete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+six+guns+hackPDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 17528 bytes
SHA-256: b550aa285b6077c2bf8029e856caa1c3bfa005342d1d1c7acbe08346d60337c8
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10700 bytes
SHA-256: 1a073e35badd8af9c8a77bdceb30ad9bfe3088f87c38a589db3b3a721bc907f4
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.