Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b9da2db41e690…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 22:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 838c75c976795b0c809b94d28f61eb84 SHA-1: abf9c8ebfa15785e7c736425013fd84d55aca9ed SHA-256: 115b9da2db41e690e53f0a5584822e0b99ac56fb05a815bb8d51cf048ca24e29
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely lead to further malicious content or phishing pages, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://smidgel.ru/uplcv?utm_term=dominancia+apical+definicion+pdf PDF link annotation
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094929cd3414---3042927101.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/motumidaxune.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/12441823542.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/resupajavirafepo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8612a1c22214203e41a8e27bb8575f4a/dugibepuwoforivuwi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/losujosamabefumebej.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/79420164907.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160909bb898f31---67649198608.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/rerezutusugefifesujadedol.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15fcebb2c---64178258273.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210730_80B3F648FB3EFA27.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/52760312533.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210630105525.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210826041107.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/xogabetelojur.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/tixuletejorukolexeraxat.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092d191953c6---sovubode.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/zugubajajo.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/98078999432.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/65519620726.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/90201346343.pdfIn PDF document text
    • http://melvin.cz/data/68287281273.pdfIn PDF document text
    • http://tercovci.cz/files/file/kamulubewagipalubogajon.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/75549652734.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7471b3b8e---vizosubikukuf.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/69655154167.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c7677a02---12211246492.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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 17776 bytes
SHA-256: 241c4afdf0e76ca88b85f99bcb4eda67453c2ebc94dee4d027ef3bde205c804f
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10416 bytes
SHA-256: 54dd20b1ca777075676e08ae6891be31c852c3927f20f99d92e2ce0c98ba7fbf
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.