Malicious PDF — malware analysis report

Static analysis result for SHA-256 b646c3166d13e66e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8159986d798ea36c98d18e1c9df3d1cb SHA-1: 48f7da2ba414b50dcc78376fb51068a53a31ce0e SHA-256: b646c3166d13e66eca9a107fe5e12234e2eaefa3c242779b29b88f6e5a13bbd9
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://tlproduct.com/userfiles/file/65832404875.pdf In PDF document text
    • http://hakanhurdacilik.com/userfiles/file/79739463820.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/79225449329.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/fevuvadetefigotojokefomav.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/66002616508.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vjfe3eiusnjcknsqs5cg5ai49o/80745157240.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/bubumur.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/wobujaxapetatu.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/16911541810.pdfIn PDF document text
    • http://kite-surf.sk/files/gijopaxibapagut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73982f242---41999353189.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091626373277.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/10226186989.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/velutezepamipixeki.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gefegegazuge.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxujujep.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/duwusejuj.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/38071866668.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/84639841326.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/valaxedegesagiwo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e1048da7243831bc5b39b47b509b9f57/49006531843.pdfIn PDF document text
    • https://quizai.com/uploads/files/13585083035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=weather+forecasting+project+in+androidPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 10976 bytes
SHA-256: 5a0e22c877812b5dd919a93f0d1e5f184cc5a0cc5fae67fdd1f55465e90960dc
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 18660 bytes
SHA-256: 9f21540199477feda59db266d89d74e634dfead44e07deaf447e61ce58c91d6b
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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