Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc12cf638c9646cf…

MALICIOUS

PDF

95.5 KB Created: 2021-09-08 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c1822114ac081dba089988d644a8aab SHA-1: a88df06b6725e77e7368b67b5edeac04937f42a4 SHA-256: cc12cf638c9646cfa8635edcde22501e99467091c263e4ae63c7b4bddd483c6a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7mvcv4716b7u7m8rffr9sg21he/18384172780.pdf In PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/63522697660.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/34102910076.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/18069769378.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/serebobo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609769b8175e5---gemumaja.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/fejawekazuweworolovapuv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d1a2e3ee---dolirepoguvikujegove.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210727011753.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8464c8b6---25059510918.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9332d7b49---71530146026.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kafojaxilolakene.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/96785570347.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/20876432475.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ee0843a4a---58911704503.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6f810bf4b---wakevivirekipazu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9j2fv0med4hv71m3khf24o8crt/95346388856.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/warujisidutosejedib.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/aef0efd98414be320cff5f49199f21ff.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160724886c45b8---11806523049.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/ruliziserikiw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928d50459da---rufawuj.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/44314488848.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/90651674396.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/29782621406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=d%26d+5e+spelljammer+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 27384 bytes
SHA-256: 9e3b17e6729645704b2a087e332fcf66be7ebdbb38a197967662eeee61370fc9
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16932 bytes
SHA-256: c9846067c8b0db5cda8017bbd0aa2b33fbaa9bcf75505c2dba60056c9b3cd91a
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_03_sfnt_off00014e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001666e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666E 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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