Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc7185805451fc…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 05:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c83044621c4fde30a69dc30c1f206d22 SHA-1: efb40e9a7892a7abf9a65a0d20c7cf764db0d832 SHA-256: d4fc7185805451fccb9604e5bfd8ce7c8fed9bd36f576eda936f79fd742260ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or spamming purposes by redirecting users through a link farm. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=aplikasi+split+video+android PDF link annotation
    • https://fotojursa.cz/userfiles/file/43311696921.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903045141_p8ixhu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/bamotumagapebudigexid.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/56917190835.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29640237689.pdfIn PDF document text
    • https://thietbigas.net/media/files/zupofilixamosasifemina.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/17444868073.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/22530179387.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf081bc53---75876958949.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd65e5ae4---65083827689.pdfIn PDF document text
    • http://espwireless.net/uploads/file/49914974225.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613849e289f2c---jekiwubejabukowufo.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/dipebupotekaropotekofej.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3b4f9ab2b5bda637e686d8105d6c0964/jazogimenivoz.pdfIn PDF document text
    • http://tedesco.pl/userfiles/file/ketekug.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/90777679197.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/42798491.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/vapuzafozap.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xanipudugarif.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/1920672041.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0778cf5c---binibamojazoguzeza.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/1406081012.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_off0000ae86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE86 10524 bytes
SHA-256: 9851ee607029047a9858eefcf70ca36c628104c36209ff6d75b0698c711284fd
font_01_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16972 bytes
SHA-256: 7034988bcc8a9e71898096902b24f8fd64bc84522ad7def67bf1946b673298ce

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