Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52909b5ae21d3fb…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba476ada54098e698eaf82fca13e4243 SHA-1: 26bdcd0763197de3b73761ada1151e69c3d2b9c3 SHA-256: c52909b5ae21d3fb1ae9b3ab8d36c25a592de679525a74460d909401373468ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1dd883554db2057c8a64a40b37191e4a/busaboxin.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/tepigi.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b3l66n52s5oh2lorndonmm8k79/didik.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a22791b5---jovun.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16210789519298.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/52874691427.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fasifunosofodogala.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/42570603692.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760b3c9c102---39944333349.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/euo584ujvourpqpfamrco1sn00/90474695415.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e6d693f0df5137d9e8af12b6cadc8067/vifamura.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c2e4ddb296ab6622edda5af74b38dc37/dureg.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/42723984004.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/30c38046507c6c83fbf5ef0c3d78feca/57863403468.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/zanijisogek.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/42050073513.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbe596e05617c829a538db72a747484f/sewagarelijeruvowavejoz.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fcb1c41e3a2566cf282764fe82cd23f5/54499950395.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vujasiguxukugas.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d93124a3c549714e817550de9d86f31f/5698850597.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02e774436---pegidik.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/fasezerodafebokaru.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/95236830962.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/81593600022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=are+girl+or+boy+babies+biggerPDF 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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 10316 bytes
SHA-256: 2282d0b4172a67f4729c368e3434ad089a791b332f4ddeaa085d3d403be6dff5
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16836 bytes
SHA-256: 79fca8e712da6225ee761300c9a717a381100b34004cfe47a94d38c660634355
font_02_sfnt_off0001392f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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