Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6f586766fe023…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 05:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda4bc38ce92a82d9c2cbcaa61ede9be SHA-1: 3eb760c177f8d5993b3b9e282c5df00acb021a4e SHA-256: dcf6f586766fe023de597cae8cfea98734a5f36a71b32af40197708d74d1a04b
164 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external URIs and a link farm heuristic points to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://essentielles-theater.de/UserFiles/File/kupilapaziwogiwefepogozus.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0759fadf5ad8de0c12dab2e4fb89ce8b/59222245225.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff47e28b01---sapomawodekepijawijeve.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/6758386695.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamutuwavupur.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/57149835377.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/40138497540.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vuzotudidoz.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/tetuvugaxebelowulis.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/11644262492.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/japoviweropoza.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tigipugekirajuxewor.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109040315072210.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/wiwikudiz.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/16619310549.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d89b5e48282d54cf87d0af217cb3d8be/96811356103.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/pumubidivaputabe.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/nalarur.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/63115789939.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/tuvuwuzapuvurogavobo.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/60603018932.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce21a9891d---11468798878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=real+cricket+16+apkPDF 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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 17744 bytes
SHA-256: 653a53366346732b83454096d28bad0504321e97c2d69c7c7c8a7b1cb7560da7
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10332 bytes
SHA-256: 664e3ddda0d031746c5f8d6bda76457e7d6b519f68a3ee9fac8e0dcb6c2a199e
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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