Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e6a50b2c0cb206…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 20:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c4ca21838a1d8da3de479857af36753 SHA-1: a759cd11c5c451a7d9cc1ef046c0b25c0b6c5d1c SHA-256: a4e6a50b2c0cb20688d9869ff0500ee7cef614c83d282ef02bc4d7332c69bb5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to obfuscate malicious links or initiate further downloads. The presence of multiple external URIs, many pointing to compromised or disposable hosting, strongly suggests a link farm designed to redirect users. The ClamAV detection and ML classifier further support a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://goodfortune.hk/UpLoadFile/file///taraduguworupon.pdf In PDF document text
    • http://humanlitech.com/files/files/sumawi.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/19590940786.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rilaw.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/wozejukudabakezujafemosoz.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/kuzaferosija.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/42247325409.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f729db5fc7---1507393547.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jaxuxumuxodidisiz.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sutarakixu.pdfIn PDF document text
    • http://baove24h.info/upload/files/momukatepadil.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5463548dd28fdaeac60d51dd33b593f0/lixofagafovasitefe.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/degiru.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/zezuresexeki.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/zudepipomol.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613821db447a9---35188910431.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/8605597030.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d65db937f101a87c385d9e82325a4f19/66725160415.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/38124116612.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/timofulixenuxal.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/35792511964.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/70346536465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=call+of+duty+warzone+apk+modPDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10880 bytes
SHA-256: b7bc66821379ff5da39b95fd87b1eb130b28564e69642deac2f0383f0a42e021
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 22112 bytes
SHA-256: 186d2868d3c03a8d0a8e57a0b42ad4a7ad21becedf3bac0441cfe67ad7d94b4f

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