Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a4a0c072e78c11…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 06:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cda76991f78505bc5f52b51887964a19 SHA-1: ac686ab0919fcb286c0605e2947e2058d668279d SHA-256: a5a4a0c072e78c116ba6242f3d28f37294ebb7daf1328d65b11fdd9a78897940
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a redirection scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7836

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://pololanna.com/user_img/files/suduropofara.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a692bd4f1---86079434696.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vobmcgas82djcc09brc0shpt07/tuzodivekivegojaxevap.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/79ec5d6506f3a56416d0c6ae437a08e9/pixiwir.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8e56a628a776452696f1604a6eb7a2c7/89819593241.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b591c6ac---lumala.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1a6e9b8e---raloxawinezutekepajimi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3erpi1fn6nh54kqndcfqoac47a/xapok.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/panafo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/40536478613.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/bisivoxoteg.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/texotom.pdfIn PDF document text
    • http://tradotel-riviera.com/file/femagizumuxalig.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/78217526732.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/gexoke.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wazawoleb.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/82146440859.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/budiwafagun.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/wamotofifoluxanukipavan.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a558069669f3e86ad602e9ef8f00fd4e/mafuperibex.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fuludutavotoxefapesesom.pdfIn PDF document text
    • http://holzweiss.at/34443908101.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/kuzowawuguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=economics+worksheet+economic+systems+and+circular+flow+answer+keyPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 17444 bytes
SHA-256: a153c0da841b232a2d08bdb467bd9cdd69bd5f47929b96b6f1e9aac405508f97

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