Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec901ebfd1aba4f1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ebdd3a5ca3835669e09ccc4358f4277 SHA-1: 827c30dd49ad9cd8f82d20cb30f4dc102734ee34 SHA-256: ec901ebfd1aba4f1d4eed599047394367805127fb161776443be5be0090248a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic firings, particularly 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION', strongly indicate malicious intent. The embedded URLs are designed to appear as download links, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=download+film+it+2017 PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/abd9c2f05b37a116758c8bf9ee869738/46492048025.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/54608089613821821d55a.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210902140850.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/43589113674.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/megosojerazawatogidak.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/22009526992.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tol5svhdgkmj60nm0riuk0la2d/33101504601.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/63569710113.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/6547173640.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/kezaxaxodeniputolobonowe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9o3sp55e0e7hreqvq5afq9saf0/labelibaluj.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/77036146147.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/32952780938.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/50206139314.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///gilewabotabu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/miwowilidomutugoj.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/96649116307.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tewadaxadifej.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/kubakopomi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/lojene.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/12094604535.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolakazejinegalof.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/85180254081.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kaworagumexigosa.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fivepirukilevuxineg.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_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 20844 bytes
SHA-256: 74bc6d726b7d3f625cbb6c83424a08c17f4735632855d8a0e59697fe9fa08df1
font_01_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 10544 bytes
SHA-256: 831210d28d9360bb8a8daca8adbd59b444997cbe44edd5d38a908a9c5c90a0c9
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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