Malicious PDF — malware analysis report

Static analysis result for SHA-256 baed681bd817ee1e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 18:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a56a2340e427cd37ef7bf7e4b869ea92 SHA-1: 67faeb1f2ac61ddbec8d692bea0bc3548fe3e8b1 SHA-256: baed681bd817ee1e3fc5453ea3721a0fd10edc6316f2f0c11c81a4d4475150fb
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The critical ClamAV detection and ML classifier output strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick the user into believing they need a password to access an archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://savvyais.com/userfiles/file/58670248190.pdf In PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/kikoduduzuvugapazexema.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137912310b23---rumememixilejupomuterewis.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a747c2dbf---tenuwazosexabufuraroririd.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ca07c1ff---gokuvawuk.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f798751e12---gexawe.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/51268141345.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/41770608770.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/revajobifuwuwivasimado.pdfIn PDF document text
    • http://czyxchem.com/upload/files/surapibo.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/79921294458.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/difasifexewatuxexivukaf.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/zununiniveme.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/dukimibegofabuxurenidusi.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/88157419910.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56911595580.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/buhhg3ov0bg4lk095071q45rbr/xejasi.pdfIn PDF document text
    • https://gdaniec.com/upload/files/84728713414.pdfIn PDF document text
    • https://digireg.sk/upload/51074832133.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/33175022298.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/84146562599.pdfIn PDF document text
    • http://dgkno.cn/upload/89237953897.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/42250637460.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0b5d5c7ac32488036f036b3ecd9034e0/regudedak.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210909_140516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fortnite+iso+file+download+ppssppPDF 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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 10556 bytes
SHA-256: b3f39b98786101f6bae7588b6fde14bd3fad59077809440b747a6c4839a40a85
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 17536 bytes
SHA-256: ede099b30a54f398a7b6a3adae661fbeab71cfcbb6d600d7caa610c6a8478022

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