Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fb31963ee29cb9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 18:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d119fc82ea6321d824b2f7dc528c6f64 SHA-1: 8aa765199c90f760f77e44b7bb6052a089c08390 SHA-256: 25fb31963ee29cb97ca89f6211e4fff0599a416a0240670a56b47cfbd5d81430
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites for hosting malicious content. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting the user to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://sincaremedicaltour.com/js/upload/putamudezu.pdf In PDF document text
    • https://sokolzgierz.pl/web/uploads/files/42362372488.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/90940254314.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/4012642856.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/sujosifajunot.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/59755537426.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109051819282862.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/9904412208.pdfIn PDF document text
    • https://campermagazine.tv/public/file/28440647833.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc054f033b---19736322972.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/15224133203.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/9653807197.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/dapujejijo.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/85621862513.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/60995992720.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/puwaj.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/gogokenipogo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134526d882c2---80435593523.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/24f5768a482e01ab041b7ea2cae487fd/xuzuredulijexajuve.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dad403c2---dovazugizaj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc73de78---senuzilezavikuvokufaxot.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/sebepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=multimodal+discourse+analysis+systemic+functional+perspectives+pdfPDF 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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 11056 bytes
SHA-256: e2a1dd2a7818475e9dbc69e1c81f9b882fbbd231a85e559a860727092b168a50
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 18804 bytes
SHA-256: e012ed09248bfe10a46d4a5904efa5837e5c7640985e5274f65e095c4f2e5d8a
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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