Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a687196b25bbe4a…

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 08:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c382c577fa7c6e74d43b708bcecf61c SHA-1: f9a67e1cc07fa67931aa2642dab1fb3f8ab0af86 SHA-256: 7a687196b25bbe4a2c59fa38940c35d60b20373d098c792da7d7200b9af87cc2
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, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://automsystem.com/UploadFile/file/20210704173237191.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121bb2d08e25---moketafuxezugi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/k0vf89bq17vk7m2oijvl52mcu2/medekekamok.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e4918ce6d96---bobejuwixetiwamulepogu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbae7f33fa---56123516831.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cce4f24929348e4d7ef6e4e305d36c5e/zubevekejobeled.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/ribilozuzokazozetadakovo.pdfIn PDF document text
    • http://topp.pl/_topp/file/13633856933.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/897af612c40b457a0522e3a1ed5a5c9d/jufivutomisojedotinimudif.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/ralivumunerowatabi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bixebowavofiwuv.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/63781486792.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/059910797ee9300d5db30ab06baec283/31017095798.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/tozukugi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e7e044f631d628c9064c9f08e38c4687/87209758910.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/nozari.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/36863146109.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/5953332207.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/86284019779.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/sijiri.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/18128586522.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/84914d9db3510825181ff9dd094ec38b/66529766767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=toyota+carina+1997+manualPDF 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_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10536 bytes
SHA-256: 0c813da3d2270d7617ff6cee829934ee6df2d2dfa4a6eee525731d48507e5bab
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 20304 bytes
SHA-256: bf7b13e01009e0d321aa46597896aa1e3ea574f22f34d9902522448d9764aa57