Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6418fbbd347966…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3898db492eba549ff93b06fd2b9f73b2 SHA-1: 77a318157450bcd6933f4176ff3f57580e531da6 SHA-256: 7e6418fbbd34796623e2d2c39cf9101a8b5355657db3491db23c110f00ea702f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. An embedded JavaScript stream was also detected, which could be used to further facilitate the malicious payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ginkgokatsudb.com/uploads/files/kuvagakijixugoji.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6b33a2a73---8450897566.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/15256292988.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/roxaloxefugizidebejugisu.pdf
    • http://encino.kopanramen.com/uploads/files/zifozilu.pdf
    • https://lyna-garage.com/htdocs/cljr/data/files/pekapajulela.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/56879621809.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/laxomowiruf.pdf
    • http://hurtglass.pl/upload/file/besatu.pdf
    • http://gostinica-domodedovo.ru/files/zemitiduso.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee98e3ac8d---76180881078.pdf
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a7ed275d8---53571754413.pdf
    • http://zubrcup.by/files/files/30305096215.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/fobuguzopamagisejivikat.pdf
    • http://duepassidalcentro.it/userfiles/files/fazujug.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/16048175495.pdf
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/nimerosaweki.pdf
    • http://lt101shop.com/userfiles/files/wapiwagamadekene.pdf
    • https://odlingfamily.com/userfiles/file/zumuvag.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/46122219694.pdf
    • https://dtd.com.pk/ckfinder/userfiles/files/11521601757.pdf
    • http://www.niceresidence.net/image/upload/File/ripusetukekilipizeke.pdf
    • http://transchem-tech.com/Uploadfiles/files/kaporowenoza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=angono+zip+code
    • 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_off0000afc1.bin
f868d8c97398b401c25ea611ddccc30e693bce492a5648e81535ee49eb1a2bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 10156 bytes
font_01_sfnt_off0000c661.bin
a03b3f7b575df93c2ac7e72cfaf9d17acbfca3342e8955b28bf1e60766d85288
pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 15476 bytes
font_02_sfnt_off0000ed9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes