Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3739931e47e9889…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 04:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e7845f352ee811ef38809205d5bd252 SHA-1: 92d26bbaef9bc34a76a6c7c57148a8f8bb867cae SHA-256: f3739931e47e9889637e4fd597d9eb04ee41660d003f962cd32a35717c2f8e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially malicious content suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/vewafitukebijidabaselevup.pdf In PDF document text
    • https://avgdesign.com/userfiles/file/89778545852.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a262ee82058---bowaxijafazikivu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/22680976603.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xowur.pdfIn PDF document text
    • http://519pf.com/userfiles/files/dozusurumobumixarabisubi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/wirem.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/gibubezixaxiretoxololusu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3370f508a91e15bb8529dc1eb4f00138/23276598076.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/13362552867.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tixuxizopafoxosave.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc99384bd5---9551259628.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4759265dc7---69598093304.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28fc13b40---pefewugegaluwaliwum.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/27673407378.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/85649209866.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cca80961---64872344066.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/54739521963.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/53563056637.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/90821512140.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/c9dt5vsflkbps1kmimu6fs2a1f/71168859823.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/6676594786.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7ffc0be1e2708831793957892eb3f8af/44832690706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=international+economics+trade+and+finance+11th+edition+pdfPDF 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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 18540 bytes
SHA-256: 0a5131dd9e63756f884f977f442cad5303bc4e6772057580faa347ffb68587ed
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 10888 bytes
SHA-256: e479d11fba28f6d971d9c7249fa62f358221990b386fd9c2b873b4bdb2d0e7f3

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