Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d535c60344ba2ee…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 16:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66b89c4b23bd285f8720bd5cabb9cd5e SHA-1: 5e697c7b4bef1e7c391c7c952c9fe298f2d9f55e SHA-256: 1d535c60344ba2ee83702b708aaa7e01badbbe61bd9a9057fe2c4b7327d497ff
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The document contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF format and the nature of the lure often involve embedded JavaScript for obfuscation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=move+android+data+to+iphone PDF link annotation
    • http://www.tokyomagic.jp/images/library/File/nobovujopoxosum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kakenoxovimajalo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ef595e2d---14300805851.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/kalow.pdfIn PDF document text
    • http://cecev.com/stockages/files/86263942667.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pukupewofotapunuliw.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/59f1888f93ce70dd8dc1f8caf42837e9/sanixidinizukazu.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/pevuratokuvilaxugoj.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/nupeluvegelavav.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/mimukutokonidopaviseg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b4fb1fa0---madomid.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/divavajov.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1279b6643fa7d161f9933015e530ade5/tegot.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/30390496718.pdfIn PDF document text
    • http://belovosushi.ru/files/mubekejozebowonudimewe.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tetejutudemajip.pdfIn PDF document text
    • http://jfe.hk/userfiles/88818129292.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/23897542913.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jp6vaghdo3e6opqv4fscf83g0/kiruzufawirota.pdfIn PDF document text
    • http://regcureguide.com/files/files/fuzafavazen.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/simowikavivu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/25228247487.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/zizazixopapabodito.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16448 bytes
SHA-256: 9e68f8b639afc164bb413877d6bc5ff5655ab39da172f76e09aa6ab7a4bd79e0
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10336 bytes
SHA-256: 170d2935c1e4a300c393c27358c8857c097cc1e306b7fcfe466730d596a9f707
font_02_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 22484 bytes
SHA-256: e3e309e1b2bbac80965589e350ab3d0b7691d0015c3a7871a751a2c691ff6f56
font_03_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_04_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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