Malicious PDF — malware analysis report

Static analysis result for SHA-256 0356c49c7d601026…

MALICIOUS

PDF

86.2 KB Created: 2021-08-29 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecdb5245b6da008dc536e09f1d72dcab SHA-1: 98d36c72c114b7c9624902879647ffc8d6da5039 SHA-256: 0356c49c7d601026f7a3b932afcfd3e81c7f6ef49317b063465f7189e5c7c1c2
156 Risk Score

Malware Insights

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

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, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms this behavior, suggesting the document is designed to lead victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=diabetes+insipidus+is+caused+by+hypersecretion+of PDF link annotation
    • http://sitoad.com/bbqjoekey/files/202108031526292916.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e5a1ca702b023b9852950361fd703639/zesuzezadopawanuxew.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079faae58953---xipuguzizumojosepu.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/60969401630.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/19493313596.pdfIn PDF document text
    • http://poaglasses.com/uploads//files/202108080546079091.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071296a05e84---97972161879.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/karawifopupexekesoloweb.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a9bbf6f7---delekewuxajebugomet.pdfIn PDF document text
    • https://campermagazine.tv/public/file/lavutof.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/78577335666.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/71579885904.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161107ec452777---rufikegorenemu.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/mpmnshl1bk0qnmbrrf3roi6de4/54294419502.pdfIn PDF document text
    • http://jonme.net/ckupload/files/30897031824.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e4fb5caee1be222a2c6390e8066f7f7/43977769844.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/81165822293.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/divux.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/96969177116.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jatiwiwujibefujawe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1a2c95a4---90791198432.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/16733652117.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3188f97235---92342893040.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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 11024 bytes
SHA-256: 699e743135edb8e1e6d2fd5e4aac74216138cb0570b51856bf0b21cc8408d2de
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 17372 bytes
SHA-256: 2f812e03cb1ec68be968c31e2248fe8648d59e4997d36c4cc48d8e41720d540e
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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