Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e54c1d74dfad7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 12:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c90530d467c4fa224da59d58ee978b SHA-1: eeae1d2f346889e488ea2a1cab4f1d9ffb0e6ba4 SHA-256: 998e54c1d74dfad7749003fb6af580bb26b192d1717d87f6b7da7ab2e5942014
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially untrusted domains suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://status-go.net/gfx/userfiles/files/gagesaxa.pdf In PDF document text
    • https://graphicart.ro/fckfiles/file/42220527234.pdfIn PDF document text
    • http://chinahongji.com/d/files/derin.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/23028094842.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161337a79042f9---lesovepam.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/31649458063.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/81257246661343700a079d.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e7ed3796eb878a508faca090716aedf5/zenuluvojiwefuda.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/18849530441.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tonozopexamazetamalum.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/lafudewoserekifaxe.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/mufetiwal.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/80533872910.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/ramajokoxenupunogubupef.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/67b2359b24d3ba11fef8453fe7f0e1c3/67731368714.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/83084828904.pdfIn PDF document text
    • http://dmkert.hu/files/file/73788560212.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/79723634624.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/xumevotosonotivezafeto.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///86747519507.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/99757608694.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tagabenomulozaxek.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6831960013.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/bakeguwan.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/67494800447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+last+house+on+the+left+full+movie+123moviesPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69924493715.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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 10852 bytes
SHA-256: 425bd2435583bbc2cea52383d75900b92a8b5806b0609f95cfff919db14b2889
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 18632 bytes
SHA-256: 7eb9f17be8c6fafb954bc1fb24670e1c01c897fd25e33e5bbd113e5860af588f
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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