Malicious PDF — malware analysis report

Static analysis result for SHA-256 608f2be5873bec6f…

MALICIOUS

PDF

80.4 KB Created: 2021-06-06 12:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ed24282e5528dcfc9cfc63fc505ff211 SHA-1: 1542726eab68a362dba46e9c11fe6a87e9820f5e SHA-256: 608f2be5873bec6feb8df08ad61975b31afe1d166b1c3d7fc2e40a9c217aa5ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=surah+al+quran+30+juzuk+pdf PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rfojl5glrsuo07rcqj5ddcugu7/perewunibegav.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0ce258fbe0845d2431f520df950d22a6/lemokibigejapominokax.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dac81d66c---8421351798.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47cc149b495f104a5ba1753597a298b2/borinupafisut.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34f67b606---duxijanigubaduvoxamonazi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wutarugaduxefujetorop.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/18685918908.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vl73ml0o8mkmj579pf1ndhse9t/14636243397.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/sorazivelakimopezo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/519912032f6a40754ef716d6b59a8cf4/zozarobivama.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c80bef1e---47195781978.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83fa9689a---13500471341.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1472213f---tofaxipawuvufitugeb.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/25a6f696a6f7e808ac371a3da56dd40b/46625963332.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3udh78qa9bul9shs8tc3q6ouf4/10506576797.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/92682303256.pdfIn PDF document text
    • http://keacg.com/upload/files/15047725879.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/relore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5204 bytes
SHA-256: defb795e901852a11afce73dee9c55703a8d2dfd18023190f35be62a659029fa
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10544 bytes
SHA-256: 049b0f27c10246dca5e46005a9c3e10e36df6a1a9c9ad63a8e0ccfe51997e447
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16872 bytes
SHA-256: a0eb4ba77f6e448baa50c4a4ca33f8167452b80207a99264ace0d80fbf1a6ba7
font_03_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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