Malicious PDF — malware analysis report

Static analysis result for SHA-256 976bdc780e24a60f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 16:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 058688027ab7132861a4107142efc1df SHA-1: 0891993033a9260ef436d5e2d11b5d68a0830047 SHA-256: 976bdc780e24a60f5bc43a077cc4b814688a1517150aa22bba295a12e0468257
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to websites that appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mskabel.cz/UserFiles/File/75612986860.pdf In PDF document text
    • http://mayingiabao.com/upload/files/lofekajun.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/56062744117.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91b9ece4---boxoxepovoniv.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/25956293817.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nigikikubovamojimudet.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc10db3e4---29410450321.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/66932628437.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/kotinemomarotosikoxebo.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugevopuvonafij.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/jegapazapezatuwobuk.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304205422fe---22456717135.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/dilepub.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051421006291.pdfIn PDF document text
    • http://edallyshop.com/upload/files/84456503322.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/26202629337.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4555125601.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f10cf2da7169c2310e908adb2f35335f/zenoti.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/sarugaxo.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/75992089921.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/gibuw.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/81651607104.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/regebabibomimoxurililuniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=l2tp+vpn+free+androidPDF 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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10420 bytes
SHA-256: 0184f611d484d186b65194b3114885e12c404a6b5863e938b96eafcc4765ae36
font_02_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 19224 bytes
SHA-256: 2e72b54e29a58d304880f36cc04ab6c7fe8ccd035f0591a7afac97919a622137