Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf9565c86b09ed…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 14:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5da29fa0d90a9fdce2ca5f56919b7a96 SHA-1: b4a87cef4ccad0279047e0d1ae801a16a2898262 SHA-256: f7bf9565c86b09edc332af0222c1adf92e4a97b5ad819e64de9eb057279ff712
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://deepakbatteries.com/uploads/file/79707627658.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c314c9b2---duropir.pdfIn PDF document text
    • http://superazs.ru/images/news/file/20528209736.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/razakipopobukixudofigogaf.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503063219.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tamalatifosudaxiwemil.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/62282420486.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/65451304337.pdfIn PDF document text
    • https://bataretak.com/img/files/file/koxirasetiwizavidawini.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4df26cc7e7ab0f5ba10beb536f1ae2f9/36981484346.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kusifarigilakagifivemu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd4afa5c5b---watebakogev.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/32609093957.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/lepuvisepaf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8db8592b5---86157113148.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/59395058295.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f789792e4c0a214fbb769720aaf2035f/6539643961.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/17384155041.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/26677029933.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/nubigimusudagos.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/barunufinage.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/lebuwubiwopodiwububaruzup.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6fbnbqtsqqa7oki22bpmphqvbf/xogoleneketupowevo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a4884990---xuvijafonobaj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d236160---28222529616.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/maragiboni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lipidosis+hepatica+en+perros+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/54221121772.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 18476 bytes
SHA-256: 473dabf24d664415ac697afa9f4440336b87fdc5973a622091b3e98105d8389a
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 10628 bytes
SHA-256: 36d91bfcd09b0a04d24564e8afdbfc8123e39b7a355670388f39b26e125ea515
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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