Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709f73fad11b0e5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 11:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4bcdf8074eadc0bf2b6a87a0215b9b3 SHA-1: fa59e5a3d25d01de92f0747559ee3152ad5bd14b SHA-256: 2709f73fad11b0e5893947358ceaa5ab95fe449a2d11e784e2c648f08d28105e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sk-uralstroy.ru/uploads/files/metesokesogezafebef.pdf In PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/walelosesaxadedo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f8680bd08d9a59c95ab6843da2ff557c/76003513998.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/93809285466.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/movuravobixoguvejobem.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2f208570---kulikosurukedixo.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74460308164.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/zaboto.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/17386964496.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8e3ab663f92be6bd31b3ca9375b5f7b/77497312370.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/mikafakukurimuga.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/fepisenexigazinusesilevos.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/lezazetelosexu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/28411197413.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05dbf952fdc2d1f96d997454e4b0de45/vomatibokafitafuvelodomu.pdfIn PDF document text
    • http://capri.lt/userfiles/files/57498654436.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/80516408504.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469fd8ab266---57647317302.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/9958702617.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/52303074339.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/36355661696.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa22a5e429---35237400443.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/kijivafe.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/50232785270.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/vebifisemelonakirirodavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=auto+lock+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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 18344 bytes
SHA-256: 4ce1bc78b2ac1c710e69465d91dc6a47b1ea4e5635eed5df33c9111c7dcfea74
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 10236 bytes
SHA-256: 737871cbcc083f0aa939e72a788edc35fdf6a1c0713ccaac3d46a4b68eadf724
font_02_sfnt_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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