Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea496e3c0d1db7a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3eaec4d9232f3ac9f5f6e120858b799 SHA-1: 200df22ceaa0d21ffc6a98e7ab02e5a487128728 SHA-256: 5ea496e3c0d1db7a52fa7307a77800645ef19c216c2721a255710be2a8a7bb6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=endometriosis+and+miscarriage PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/42407178e2e12010e7a2fb5febe48490/66100936843.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a61223af---18614072592.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zegogapujixotoxoto.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kapofumuborefiletep.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/rokewefotolepek.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e4e38319---gozonubipajixipesamobuvi.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/3370150610.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sugibikasiwajebuvafuk.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e450dbfa---91137296627.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210718_0EF2504B728B9F0E.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bebb7bc7a---72630784483.pdfIn PDF document text
    • http://teplospectr.ru/images/files/49804285598.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3ab1f9f0794968e07b38699115d3953f/87152654001.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ceb9e1bc6cb0a6201eaab3d3bb69e498/10428911110.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/titakavoje.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/53303795322.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/92164395521.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dr4a9ls6til3rnsrv7fjti7tj8/gezaredugalumikatusapetas.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/93906777033.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/06793a215ebd34de3dcc0c548e3da3c3/81613514404.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/bphljb59d2uhfi3s8pt7hllt0e/pabaza.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bf9ec8c3---21677925294.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/zesukosexedefetedilisi.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wosodegaju.pdfIn PDF document text
    • 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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16816 bytes
SHA-256: 7fcf1c94bf15d92a968a484dfbcf0fb443fcd636f68620d374ce1aa59e742e55
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 10648 bytes
SHA-256: 6a7892286bf4fbe42fd4a5982321e559794227027ce354f6101cdea67bc02367

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