Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b87c159d24be94…

MALICIOUS

PDF

85.4 KB Created: 2021-08-11 16:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6e56c750dd28cc987364b87826cf2bd SHA-1: 1ef2f6200e176bc82b355fd05c873ca9102a0468 SHA-256: f3b87c159d24be941a032a6151e976c35cbe6e2ebae32b4cfaaec7939238eee2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3130e063---65682630964.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833d53870fd---nolukuresuk.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/zepisiwowabajomu.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/mogipewuwodeturewa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0c3ecc19b599be151cb2f55389c2f315/2230399175.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gdmcp6o6f7psfqs5e4rpk4nh4h/baselemesasivuzuw.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb2a942e6---84018270053.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c57bc902---52834107874.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/95370344793.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/japexof.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dc4543c38---70933402414.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/20763658814.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d02ae8917972d283e5ed982c0667083/60363955243.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/48669632617.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/79852799704.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/83615968494.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/34377b0a5f4d6d7f1668bd56ec46ff1a/jexejogim.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/popodusukokotaz.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/zinewuv.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/16379931949.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/zinemenawubux.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c525b2720071c3cb33c39cfd819d41e/3387447174.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16216777335937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+tastes+good+with+apple+crown+royalPDF 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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10984 bytes
SHA-256: 35aa355bfa7532e3221cb9bd0750e2201fd471bd5a0eb9a33127bdee82e4d6c3
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 18072 bytes
SHA-256: 1e5df7edd2db08f4a18849a72c5d72d54c6b5ae371532f77d2ab2a607b8a6c6c

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