Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4f5647ab16eb9f…

MALICIOUS

PDF

127.7 KB Created: 2021-09-03 19:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f60b58fb5c1c4f045a4b51c4cae6639 SHA-1: 487780c78a5878b401d637782ad44d9aaf1751e5 SHA-256: ca4f5647ab16eb9fcd1db59f4beb7d410b08c714cff1affe083f4a58b89b6f25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics indicates an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7661

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0256bf5cf02aa8f83c93e5040a59010e/miwuxosezabebovesuguj.pdf In PDF document text
    • http://szentdorottyapatika.hu/files/26205207776.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777ebb34581---gaponasotab.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa91d18eb---dolibojafikegejola.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/wuveludepudepupevokegerus.pdfIn PDF document text
    • https://dm288.rs/slicice/file/sepozav.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ea0c0d7c0---13741584272.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/69002339142.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/50781549799.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fabe0896b---faxuluzufuraxeboliko.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbd2ec769---4601478946.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/mivezorububujak.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/kalifemodabenaze.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e60d8efa7df5f561995b222b00bc4c6/70835413326.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3f87c54bd0c0650c7697ac50d40fc06c/taxexubebexe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7f7a262d3fb60c46a174ebc17bcdd836/46897580696.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/54296173062.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f7064bb825f79a934d4b5c692468ef20.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bekikowepexatikilom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=berkeley+physics+course+quantum+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA82 18524 bytes
SHA-256: 576ae6089bb0139492cb4e7900058e7079a7d4aebd03b8d64d3b0c2733adcd24
font_01_sfnt_off0001d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9DF 11392 bytes
SHA-256: a23d08e0ec0ae36ba08a47671c93bffeed9216493192dd989aef9839db14df8b

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