Malicious PDF — malware analysis report

Static analysis result for SHA-256 162799f09e636dd1…

MALICIOUS

PDF

88.5 KB Created: 2021-09-09 10:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a79df1a85db355f77b0ad90c85d1573 SHA-1: 180a14a46fd3e5b242a982a13604afeacddb39b7 SHA-256: 162799f09e636dd1e9851541ab2b47b0926227fc127187a9760d0b9ec135154e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://cathugo-yachts.de/res/wysiwyg/file/74782256034.pdf In PDF document text
    • https://vanrun-it.nl/userfiles/files/develodujapazugetafop.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jogavilozapawoze.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/74699881445.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613433526b124---8960171690.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/12329114138.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/45507852784.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-5/20210905231011522931.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e62de758---gojuzerak.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/zodububeborafivofajoza.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/17225478154.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xekibo.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/kalijerifawerukafado.pdfIn PDF document text
    • http://atek-ent.com/upload/file/8979843132.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/rumaweboxakadojazifimoro.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259264cd35---23075465837.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menerixunugatomali.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/wefidadumerexanitegixata.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/jowufarojovukedoj.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/80782730030.pdfIn PDF document text
    • https://medtek.vn/storage/file/jewidil.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/raxisuk.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109082154253960.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/68584907344.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/tuvipozabujanaput.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afff5f71c---52602972097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=killer+chess+tactics+pdfPDF 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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10484 bytes
SHA-256: 5a50dda2b615c3871ccafcf00ca2613446ae24d4e0bd9ab4788c957959cfcd36
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 17680 bytes
SHA-256: 09d113a355de0eb4c55272d40d5d711b0b7775a355c54bd4256bb6f481d3702f
font_02_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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