Malicious PDF — malware analysis report

Static analysis result for SHA-256 541fe99209b837fa…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 15:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab5933e57a80e7f21134dae658350fb2 SHA-1: 5ccdf510c4003344d9dcef58837e77dcdf0960e0 SHA-256: 541fe99209b837faacefe360cddfb2aba9441ee33650b82ed7fca75645c1528a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160def47db092a---sebovexukofoziro.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/11746208499.pdfIn PDF document text
    • http://learningkey.org/userfiles/18093317727.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/35965305374.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/72jnpubbr6e52ns6kp1vulh771/poxuduvulejobavaxoba.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1d76c8e606e74f275a32c66bf81fdf6d/jubowidirizalasalazizuf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609532f28c381---misufujetobus.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/ledodono.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16111c8bd7c879---sanikuwukurovidiva.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/misabonukevelolisanu.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/xoxexeratusoparemesa.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/bifikotob.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/48602926477.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160758e9b10e19---kafixirakabizus.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/jotid.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81455420323.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108120336046097.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112052784f3c---71663489227.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wizokabetewokakubusivubiz.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/620d03cf92ea77b87f8514c37c4fb970/74169285903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spanish+if+clauses+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 18788 bytes
SHA-256: 84ff0ceabcc88b17a0c6ce6eba076401c5247f7d620fab5cdf172f59f2773d14
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10928 bytes
SHA-256: 1f3d86272394d6ce4c4c342d9fe3d9d0fa38ec082ecdd8b43442f54fabcbc9e9

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