Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a5fdd1775078a6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 20:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f595394dfa724f0457c49e5a05149b1a SHA-1: 35fd2efcfee555f6249bb6306d92fa2f7b2dd809 SHA-256: 02a5fdd1775078a69675d57ad137b8bd53efe3980897e810785d3010cba19917
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lixupeng.com/uploads/files/xomatidurodumi.pdf In PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/42794897494.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109060626288208.pdfIn PDF document text
    • https://schmitz.cz/res/file/xerawazinuzeje.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/23228866156.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_154820.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/selokuwonowapejizupufu.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/zabowo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/83363081262.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/96901666526.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/72799850145.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/34aa5ce70172dd248bef21ebf6c0f8d7/silelanazutemat.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/27963864371.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613161a707bd8---17259538077.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906005121797.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090304573273499.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/80407349128.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/43372709700.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/7105813301.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5883f5a---kovifujekepaditobewogiw.pdfIn PDF document text
    • https://kultmotor.hu/images/files/63210790526.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/49147077248.pdfIn PDF document text
    • https://synersys.fr/contenu/file/47920914602.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/88223546997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+car+mod+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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 17640 bytes
SHA-256: efa682f4f45e17fee1a955e8d5286791dfef068cfb033bc23ef77c7efb411c7b
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10392 bytes
SHA-256: be843f5b347ac02a66c3c9c8774c66954dcc5a9f28914c8c8b6f3f61ab81b0c7
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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