Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afe4309b679b1e3…

MALICIOUS

PDF

108.6 KB Created: 2021-07-30 02:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: de3d21ccbbe003c3a50da7cc59ffd646 SHA-1: e185f1f0f35b36a627b00f156433e18b0aed14ba SHA-256: 5afe4309b679b1e3b88af76c0367ff6217ebc45634fb2faef36312f452754e7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions like exploiting vulnerabilities or downloading additional payloads. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://wastran.ru/uplcv?utm_term=asap+rocky+at+long+last+asap+full+album+download+zip PDF link annotation
    • http://cwesp.biz/upload/file/wudutedogidutepigajavidaw.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/rovanufoge.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be14183faf5---xuxamok.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160850d335bb3c---19800357100.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/60154626869.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xunesaxuferumaxo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf74b8ab5---pejutagejoxaluse.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/701343ea1b6982dbe7749c492f50ea83/30746090012.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b111097c0197f8d2a4692a77e16f3716/lizozevoloxogoxi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/564e3cb28204c8e168d2df290ba2bcca/rovanewesutoxejogu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160803c28e14ae---22975053250.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/firamiru.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/nufowaveziwupotomed.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/bdcaee3ec5c1f8138ed6c24be90f841f/68488520198.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/bunebikigozegilatebu.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vepoxawatekasulaxu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vadomokowijoniropufa.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42729754290.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sovb28c81277kug2fqb9usts1s/dotifobarogenajesuvolu.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7cd4b4e4fbd828efdb29284554b04bd8/musefosos.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/vekelalevixafeno.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/87770133116.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc82a61957---68847679110.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_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 18216 bytes
SHA-256: 5514ba9a11834d34d9c4ac93a0f6cd59cf048520d44fbf33b97a14c06e93d043
font_01_sfnt_off00016ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA1 11404 bytes
SHA-256: db2c4a87e1d630ad800c89a1e8ada4a19428479672ca41c4f0da04405347630a
font_02_sfnt_off00018945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1