Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd685fefa4a39b46…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 10:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 32dfded37764f5d86d4026be7e9230e9 SHA-1: 8dae8ad1fca34c4c47a65b0828d01fbd6943af61 SHA-256: bd685fefa4a39b466a396662f0c0d12a98bea0ba8222175b999561ee0fd7a5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or phishing content through these embedded links.

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 https://stepweystudy.com/ckfinder/userfiles/files/65347469767.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/fizoxegomotejif.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a710a0238---99929454501.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/32323101937.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/32855332718.pdfIn PDF document text
    • https://nevisnews.com/userfiles/62848512431.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nezupeduzizejoxed.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/95874653757.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/99802666116.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/dapudixeb.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d438d18b5---mesoxarisetadido.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/zosogudovew.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0400000a8---46563899337.pdfIn PDF document text
    • http://arucax.am/user_images/file/53029996497.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/35514337628.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/85999998620.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc8f07333---60683160399.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/jeretomedekuxisigokef.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/tobimokugevutolarena.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133adffa4882---boratesipuxemetef.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gekemex.pdfIn PDF document text
    • https://ienter.bg/files/gotixoxexegilajosabi.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/70776770138.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/96456481959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+to+excel+convert+free+softwarePDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 17264 bytes
SHA-256: bdb462a9b3ba579d833efdefbc44bb2463bf885b00a99f6098652e23a3846903
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10632 bytes
SHA-256: 59ed0d86de8baa0d35119842479072c3283e79d471dafdae343a0df20b8cfbdb

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