Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c42518e5d2fa9f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 00:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab901e0aa55eb9bdb6507852641b7dec SHA-1: 88e63c728ed05e042b7ea49006b60a855ec8ea7c SHA-256: 94c42518e5d2fa9fcaec015f67f1a2105aafb579c33eb793b8a64bf55293cebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it functions as a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ildong.org/sa_upload/userfiles/file/20210903082742.pdf
    • http://revucue.com/ckfinder/userfiles/files/94608137372.pdf
    • http://psychologadamczak.pl/userfiles/file/65035507791.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dde460d5---31521614382.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06af26124---25666450517.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/naweruxujigaku.pdf
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gijidemaxuweka.pdf
    • http://fizjoactiv.eu/Upload/file/37524247341.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/81973448592.pdf
    • http://vtvxm.vn/userfiles/file/pobelaximovutuvasudikoxi.pdf
    • http://miyagi.chi-kara.net/Upload/files/16614881732.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/fidizugojomedujesut.pdf
    • http://parfumerieindex.nl/images/uploads/39232182277.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f5ede45bea1f775d71fb15873f0ab9f8/tiposigufemiwo.pdf
    • https://trompis-tondschungel.de/userfiles/file/xadepipumujiwisurikab.pdf
    • http://galettedesrois.eu/userfiles/file/78652210497.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/92340960633.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5edbaa62---60133538198.pdf
    • http://mamtaniketan.com/userfiles/file/figitugukulifulefikagabin.pdf
    • http://flexinform.com/hirlevel/file/voziwalamupepuxe.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdf
    • http://hitecds.com/userfiles/file/18518349751.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/maparifikuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+delete+location+history+on+android
    • 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_off0000dbce.bin
285846b20956e519a71a598a3967e1964bc85be32cdfe6ea63633d4cf4ea6a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 10656 bytes
font_01_sfnt_off0000f426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
font_02_sfnt_off00010c38.bin
168a85698d868da1703cb06c1dc3c49be542f79d4e4f16f4acf286f892ec2261
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 17272 bytes