Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4292253d9f3cce…

MALICIOUS

PDF

80.0 KB Created: 2021-08-02 01:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dc7b9a3c9b2adc6d4beca4aa66bde75 SHA-1: 3678b54b8e6f1db77748d033b05df63a59533d36 SHA-256: 1b4292253d9f3cce279ab9c830f4f509921a4bf5778739da79df14e8fb9c7be5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/87391250660a2927c2ca9d.pdf In PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b48e34bbfd7462fe7300f0d9bc963526/nogajegugolewexurukovibo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66664f087---jironipesotedosimibak.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21440c50b---bosubariwajabikalop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3674cee454---11352138412.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kedevimetodoxedeje.pdfIn PDF document text
    • http://fonixkoncert.hu/upload/file/bovikixowixubokulorewar.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/38931746901.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56746d35---28903415428.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/54885151034.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/sewuxagodizubufum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160787090efab1---xafajozadepipaged.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/sewiresi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f3c8f879---67711219352.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jewoxuvirotebapove.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dudibalifolekerowoka.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6fbc17a1e6db1bbb1e325970917134ad/59431339981.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a1670eda4eb65655657be15bb643560/59423417787.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/62427160608.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/lokogeregariro.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607601180ae73---puniwizuduwasaw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44a8c664a9---kasipubijasigo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608326a7c60c5---bawomomi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/suseuc7jn3sdf0upl66317famn/fasuzuzozemiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=retrocalcaneal+bursitis+mayo+clinicPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7a7231b1ae265f77e465c1576fea4f06/73575954414.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 18112 bytes
SHA-256: a65628ea04910821b54c2b0c294879eadb49f36ac87f65d497bb89ed7683fb8c