Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40bbfe0524e811f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 10:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57babb92709fb6ec3e3ce7306d4ba597 SHA-1: f6070f250c2c8c5c372cac79419c6798e49277ed SHA-256: c40bbfe0524e811f78bf50203cd6417b683adbd1740dae1b4d041388dca6fd5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://vnsteeldetailing.com/UserFiles/files/wadosagenofonakin.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142982eb342c---62208886012.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/30101946986.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/10226185364.pdfIn PDF document text
    • https://ksboutlet.com/file/files/nixele.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce21a9891d---11468798878.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/83771238509.pdfIn PDF document text
    • https://e-midas.ro/files/file/bokesukiki.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/1805797296.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/wenidozurobojag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/04d49f9331945f32bbf2937e62f6dd82/bakatimulapaginimojoj.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cd15780420ae95c81163902e2a9edf5/zukodeti.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/lajifuvilibubawezawuwavo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/24428992748.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tibivas.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9761c63910791d7c846455fb73b1fda3/50401576183.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/23762439959.pdfIn PDF document text
    • https://swiz.eu/files/editor/37620729251.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135be67a64da---wobekaxavukiw.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/xoxuso.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/10648119378.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vobisumafek.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/35586966853.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/84791426704.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bc57acb---19715565773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lolita+pg+house+full+episodesPDF 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_off0000ba48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA48 10632 bytes
SHA-256: eb81e352e9c87b6f7b5aa3f58ad29f783cadd987a9896e37f2280936afa52909
font_01_sfnt_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 17392 bytes
SHA-256: 994112c31d25562206d806525a03574cf3d8989ee73ce1cd9eb56027129c13ea
font_02_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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