Malicious PDF — malware analysis report

Static analysis result for SHA-256 6746aee3ef6cd2b7…

MALICIOUS

PDF

87.1 KB Created: 2021-07-25 17:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7041458358c17d3997405926a4f282cf SHA-1: 917e24c35506f90d936a84d867ea4557b5d938db SHA-256: 6746aee3ef6cd2b754aef62fa3e9ad3f588a7221fec93c950cf898bcaf220a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3146ac63926543d275a7acea331313de/90758478460.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/249oqomlp3p792egu4l7thgu5i/71142653328.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f27a062f---95223289177.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/527799ac2e55f9663d0c21c29e18a972/kezemo.pdfIn PDF document text
    • https://qnzar.com/files/9889735394.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///10086251743.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d020fe54---mazivoxudexenumefisanes.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/golalomelamepukisijalus.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077444f53e28---48789841504.pdfIn PDF document text
    • https://siroyensao.com/upload/files/wutuxebojozazom.pdfIn PDF document text
    • https://tomas-music.com/contents//files/puwuxigimuxumugiti.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/11317884396.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/c52b62c0da5e1bd1c190af7d0f865f77.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/97270564094.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bbe6c25---80202145769.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/kaxinifi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lh311praarb880k3elm3kgql2/dijigiwagefitat.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a65f1d9f82---kuwonugafokeza.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c63e3c48ff751c93efa8332ca5d63eab/sutipenizali.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/33009034851.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/2euqv2u0h057nvhc0itrstto60/30703561121.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/62360581396.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jixiwigukutidonuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=microsoft+flight+simulator+x+free+download+highly+compressedPDF 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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 11460 bytes
SHA-256: 5bde4460eb9bbf14bf601bcc278f215cb855a385d24637a11b3715067eff181b
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 17100 bytes
SHA-256: 28dcd6a73b65d0c14b2a1f6ce9fd055bb4b61797b6297297502612c6820fa110
font_02_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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