Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b8bb0361a6f01…

MALICIOUS

PDF

84.7 KB Created: 2021-08-25 14:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb4fd1ebd028e4a19a5e8ca7c97b8e9e SHA-1: 8153e8f90222fd940f63c1910ab6b840e7ca9c91 SHA-256: cc9b8bb0361a6f01e1b3d985858baaddbbd307a953a3f4a66bbd7465df4597a9
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=tb+is+bacteria PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e2vvcfj8nvlqm61ep97hc2gjb9/lowawulavi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/guzotepajukuvagirogurer.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172921512568.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b906f970---42651813046.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/49679050592.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094840ce07d3---bojaduxalaxigonemexed.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/97107121699.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/39186126837.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c393055d502---10085277615.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ac84a4336448f93b1dac8dbe5af136be/wufidabuvematibeg.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210802232748.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/lotafaf.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/vituvasuxazalud.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/61142056039.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3e561259a807e3957e300381edfffedc/vinozebox.pdfIn PDF document text
    • http://idroter.org/userfiles/files/koxexisuvilewijo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tawonogenegenate.pdfIn PDF document text
    • http://terrietanaka.com/library/files/91120563628.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/30668972737.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/98337010641.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8767fa311d7a4e1ce1dabde5f540a8cc/83654174502.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610136bd1aed0---7851046380.pdfIn PDF document text
    • http://medica-brno.com/files/somasuligewo.pdfIn PDF document text
    • https://medlineplus.gov/tuberculosis.htmlIn 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 17004 bytes
SHA-256: 10da77a9ea392ac45c417128935defda8d55368804eca383cbfdd83e91c09d9a
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 10056 bytes
SHA-256: 1263503b6b805930190ea030e8e5ff609d2e91a1ffd1f5c3c81a532b492aafea

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