Malicious PDF — malware analysis report

Static analysis result for SHA-256 3053d61687fa7678…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 23:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0e38452265ad6fdfb9e18e7cf0b6f0a SHA-1: 9fd440a4fef12636f0b728376e310cf6deea0920 SHA-256: 3053d61687fa767825107ed4c4e3e725f1454337c5bfc82e333e52eb99c9d650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=best+battery+calibration+app+for+android PDF link annotation
    • http://southerncross-ex.com/images/blog/file/97410669769.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sugakogivajugesiwur.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/45288024613.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wusivuzatewu.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/kuxolulajijobelof.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/92009088970.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/derokapujodapipafabito.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87731533052.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/fokojalulezuzifu.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/29193040128.pdfIn PDF document text
    • https://nomortiga.com/contents/files/xamevevigo.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/48354330416.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/saduzetufet.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/75243841509.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/179ae7c4272f55ff6d9fd046ce5f9462/dasesu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/515594384.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/kijikekiweretes.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vepudisulipibozixudokajox.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/64730760898.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/43382524927.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/77179216973.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jakebikaxonopotelevojeto.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/88742458550.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2cd3c62c---rafozimitefadexojekalede.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xewameg.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/50477137920.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/60307571165.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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 10920 bytes
SHA-256: a533ce45b9a5eac401f10649eda3ea5047c73df8ee9a6b1be313dfb3e271eb68
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17856 bytes
SHA-256: 55e39d6f1fa3e74a1dc86bb7b53ce02518b61272b56a3ed1f16c036ed10fd0bc
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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