Malicious PDF — malware analysis report

Static analysis result for SHA-256 c377d3d7a94ac3c1…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 09:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30c1fac545d46de64c351495833586d2 SHA-1: 827cc2dde1213f01140fa5fdb7a27f96d2107739 SHA-256: c377d3d7a94ac3c19cf270d95f7df50f6c8351cccd87d865b4b3d5eacbaf7687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised or disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://kondicionery-krasnogorsk.ru/upload_picture/file/13639583769.pdf In PDF document text
    • http://mya1fc.com/files/ckuploads/files/52470831867.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed431d9514---4075658961.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/75ff07575bb4165448105bb3e4b0041c/basinarelufufodiditevomad.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/954a888094ec03dd9ed5ec36e1606c29/4065420942.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/zekivikuvofef.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/wopajiso.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911100840d2---mebisedomamukobav.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/36919725551.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/32766063041.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/16238441452.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/17118536160.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080789b89c1c---jafuro.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2665c07d7---81231203054.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/42316038554.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d40826ecf4df549a9ae35a591478a384/gukowozelunodogi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b8c32df4---tefivojujupitaxizekatevop.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b71ddc8a5---42397887161.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd0205aaa9c6d0bfe181cab4ce7af33b/gugoxomukatuzorobaliv.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/wajetorovegaxajagurega.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/giramotawimitetamiwiwa.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b336946388372034ed2ba8e2d9393cf0/98959280240.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cef5477df46---33684007450.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9942dc92ef---26255830624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+shortcut+for+a+check+mark+in+wordPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10964 bytes
SHA-256: 419834091a9280ce6f7dc80c8c87578bdccc35202a2bc7a6e82d5ed97278ccb6
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 19520 bytes
SHA-256: f15333008334c4b049edc87e135ffc6341e45524ae188938f4cc315e7db0e782
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5F 16596 bytes
SHA-256: 9912c10b08d9d7ecf7bdeb20758fbd45bf7fac6b656a397e4165986ec67ecb69

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