Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f91a9692e123592…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 06:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5d4246086a23586e6e22e3fe907df97 SHA-1: 271e69bf5dcfaca01119325c712e1c6c5a92e4c9 SHA-256: 1f91a9692e1235921347ec5a872b2b2736caf70c713e7f60e16f689b2055956f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=makalah+tentang+psikologi+pendidikan+pdf PDF link annotation
    • https://pmms-online.com/assets/file/vixivusifil.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/laxumuwi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/geriruzitibajotef.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/javorupa.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/gufuwawupa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dufuw.pdfIn PDF document text
    • https://esvigo.com/upload/files/17733890212.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/79210926478.pdfIn PDF document text
    • http://techbis.pl/files/file/mivezowajevijezodot.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071589062ef8---muvowuriwojurik.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b082ce7de---vizoturinojizaviwob.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pupurosaloneze.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/woloxusuwolivixodi.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021072503424973499.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/lojunu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba2fec0bb---fekimusazenukixus.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021080721415581.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/9062831126.pdfIn PDF document text
    • https://dm288.rs/slicice/file/webukalodokuletelajefeno.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nemurixoxigi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb58febb2c---bijatanapuwagifut.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/792ulnvq5c5afh2fjts6s4fb0r/66169582981.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/pavegufakajexenomilura.pdfIn PDF document text
    • 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16888 bytes
SHA-256: 2e580025f1fc149521805637a5645a8cc66755ffe0484420c791e38cef286d9c
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 10760 bytes
SHA-256: 4a9ef3c9f95948f5b29496dff8998c3b00c7d5ef575ec3b125f3a9e53d4eff5d
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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