Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e115199df521e5c…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 13:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e9990e421e8a6316bb1a383cf53e73 SHA-1: c936aee428d507f4cf5682b1bc173afb9bac8cf7 SHA-256: 9e115199df521e5cde01c010d37edd946158f17e8569e7471c5b99bb0ecd364e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Tampering

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document also contains an explicit instruction to disable security software, a common tactic in phishing and malware delivery to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://polyalpan.hu/_user/file/gisurazofijavizemozazak.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a948bea92fa---wesenojinadaxolaxure.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a8beb64caa1181fb862dee76263d8333/25521161853.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/80505796926.pdf
    • http://banhangcongnghe.com/upload/FCK/file/73390984146.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/846b103c7ea8ba8132ea23693e9076c6/sidixalup.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c3db95e4---90428661847.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c39177cd323---mazeluviwipefisanixefew.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacc2d8191---zufujidolo.pdf
    • http://batiment-tunisie.com/userfiles/file/96702709681.pdf
    • http://jingluo.net/uploadfiles/files/25057153871.pdf
    • https://defaico.com/d/files/61754714390.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/onb9th9b8snhheouub71hbh6f6/38111689881.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fkbt3deuc9ls4pf7d7aet03aa3/42948442502.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ca43c57a---7319795838.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vexixinipovaxakemenikanus.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55993cba6c---27488908792.pdf
    • http://ajivikafinance.com/userfiles/file/49181592662.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/vuxepir.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/88a668e8e74b0def167dc18a8ac26fb6/77461711933.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ugbhvu7bfci52cfosee2e8rjl9/42181186574.pdf
    • http://ausafe.net/images/art/files/56319001418.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a3f09531---molanixorefanesinolovafu.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c9f8711b4---fazalomiranamorijutal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+3ds+max+2018+free+trial
    • 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_off0000fa81.bin
07998409bc1db79896461720a5f284efbc4a9fee7e7e261eefb001af3f0a8856
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 29568 bytes
font_01_sfnt_off000136a5.bin
c1fee432d229884b19005a6b8778a4039b4e6fc1f9f3c38b8a68c5af98cba819
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A5 11380 bytes
font_02_sfnt_off000151a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151A2 16792 bytes