Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c0fae7c88b0305…

MALICIOUS

PDF

76.2 KB Created: 2021-08-08 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5879932bb718f6dbccd0ad791216bb67 SHA-1: 1fa3137e2be4a7192a658eb256529f42ef762d30 SHA-256: b7c0fae7c88b0305d3ba39120a31756773a13eb70b5bca79909d72f1cb66cbe8
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to PDFs hosted on compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution campaign. The presence of multiple PDF links suggests a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

Heuristics 5

  • 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
  • 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://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0e3c990cd531dde828348163af578222/guluguvupi.pdf In PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210606120136.pdfIn PDF document text
    • http://entrackintl.com/uploads/girederanuwig.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160873ba252e0c---36547785943.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/76276719681.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3c675b263---88187842824.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a9556b9e---gudepesuk.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/rimozasunenefoposon.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/88249166728.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/gipaseputemetulo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/vuzavumejinefu.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/43242994815.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c57f9f4e283902a0ab6d2640883cf97c/54572306520.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6da2f14e5---wevutumo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/403c76369fbf2e30c609807870c71743/forizazinotaka.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/desonewinosi.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/31303612025.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/20511214033.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/1629290480.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/gineji.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gimopuza.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7m73nfphiiekfgfq9v01il59ck/32049640631.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/kukuxoloma.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e042d3ff8d---pofesumijejos.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/mebami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=differential+diagnosis+of+intrahepatic+cholestasis+of+pregnancyPDF link annotation
    • 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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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