Malicious PDF — malware analysis report

Static analysis result for SHA-256 6634b76fe09c3fe6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 20:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60e673dc24ac9a3ede67ddce9e26cafd SHA-1: d8ac9999a1c5e4fede23b801577230402b8566ef SHA-256: 6634b76fe09c3fe666ebcb813995936d07e77aed5c58a78eb619f819dd65c94f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/35fbulsb60hp76bsn52h86ptn7/8666135410.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk5n15h15ld4cd28443b68i8of/terewipalunafekafuzaj.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/97720483495.pdf
    • http://presssimayeshahr.ir/pic/file/xefuvapatinuf.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/23195883296.pdf
    • http://kripasec.com/userfiles/file/gisifonanuxusutelak.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/rakuxugokotuxepi.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161292f0ea4b7a---5600531389.pdf
    • https://eminencesolutions.in/resources/userfiles/file/lokuwotoveko.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/ranukegebiguwetemopuga.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/670290b20691a0a87cdf5bf8f65c0010/mofonitopetapusuz.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094afe428010---mibapimuzolexifogaregu.pdf
    • http://przedszkolenisko.pl/userfiles/file/4255380008.pdf
    • http://savvyais.com/userfiles/file/66637837045.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608daf27b23e0---daniso.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/patek.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e43b1199---99715690556.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bd599d129be---moviwimunumoxigox.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f600f41bbf---minisobokusurimuzefu.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b2126d2cab3e046c0e46bf3db51bfb6/bulubo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116b3ff9588e---77437753236.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/bexad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dell+precision+tower+7810+specs+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 16792 bytes
font_01_sfnt_off0000dc82.bin
dd66e7bb96c76862cd1cdde19f5383200b0be1fba68570b2ea83b08fe08cdbee
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10972 bytes
font_02_sfnt_off0000f630.bin
93d78173970e2882459b8b91e995814df1590e3d97dacdbb8b292ca679ff38dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 17320 bytes