Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e28a86ff3811b19…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 23:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a35c92718babccbffdccc79249b51556 SHA-1: a0de136ef107b8b054d20f11e9ef0f18d3b476fe SHA-256: 2e28a86ff3811b19c85106c8d6250cd7395c0ae64f34ac1a98a0642280851d76
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and presents a fake CAPTCHA to trick users into clicking malicious links. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lrsinc.co/userfiles/file/65774294929.pdf In PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/tosemi.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/95275667297.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/newom.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe4a45bd5---64374725286.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28537454405.pdfIn PDF document text
    • http://zatacorp.com/upload/files/genonedobili.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kagaxuxavisevulo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d76708010---rojivezomegupop.pdfPDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb2b73757---zupasaza.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/lisabimu.pdfIn PDF document text
    • http://medi-sen.com/files/files/5897282246.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908075259.pdfIn PDF document text
    • https://fond.ru/userfiles/file/39636185683.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613556d9d1222---78485765953.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/sidowe.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/84264493181.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c64603cda---20629520866.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/10424094655.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/wadumowexamifenogulu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161384e689a153---jeremi.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/7573233543.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/nuxajapenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=creative+destruction+obbPDF 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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 17964 bytes
SHA-256: 1faad38ea74509556b6be45fa30757f9b5c03a1398c1ffd92613a0da489e9f2e
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 10656 bytes
SHA-256: 2043d1e189efafea6bb07b8bc3d7672c6c43ae7463a7c2a0bbf0fa8fba2a3ea4