Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac5c96b8d20bbf5…

MALICIOUS

PDF

66.7 KB Created: 2021-05-29 09:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7bf8254443469e5e1a20aaacaa648b7 SHA-1: 255c710a9e8f79074a58ac04ecece1296f3e4aa4 SHA-256: eac5c96b8d20bbf5ee0cb1f77b6958b36b0c05ca659610b4a0e453aed0660c8c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b02208103---58071062861.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608292c782978---31068731481.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4be0df0aa9d63db343a920ca123ee9aa/duxawaxetefeniba.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8bf90acb8428fba5b2aaa9e8ff322677/6738536641.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66f539006---xutujanajoxolef.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/van145ng3o0knq7cfe3v75mdd2/bikekifopafekizi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842296a43cf---72682494610.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075af36dacac---33246695627.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160814308d85d3---69469511608.pdf
    • http://jatyn.cn/upfiles/202105/file/1620474752.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc9db0af9---saragujosebevisekodinap.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56a493032---90438526982.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/bejowe.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/motijufafavanusiguxavamu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ca29137c97461f5b8ee17ec79e60445/93391066131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wibr%252B+wifi+bruteforce+hack+apk+download
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf61.bin
2c6b7eb798d2a9b83ec49af7869a2d1cccec68df019b7c6d5b00743d488c29c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5372 bytes
font_01_sfnt_off0000e1bd.bin
1fbcbb308f8a5cedc3191567c63752c494941b35e90d80296ab381917a64b475		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 10340 bytes

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