Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc025c073c819c8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 22:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 370fdce8cbbfe320038093d06a7bccd8 SHA-1: 8f3839a701fdf3748ef810031e223d939ce042f3 SHA-256: bdc025c073c819c890c63721f7b46487542879a3a6229ecc0b4efb7be82f8385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The file's structure and link farm nature suggest it's part of a broader campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n5j8ruomipal33vvjffn0qfk2/toravuzugetaluzof.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8f393785---dogotumiriramebupajeto.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/823169528.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/57858164935.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vibaz.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/78907781096.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n5dbnidccv59u4s8raq2hsu0pv/97761288730.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/86781641415.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/32282910200.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/janikopepuwifas.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/xefabebutomaxawuteladof.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafc89c61a---64937463783.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210805_FD853CF8E701FE41.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/56074044448.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/papulunogubukibojeso.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cb83e24---86774234285.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16114996d6f009---48556860957.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05b7e7fccc---dijexobinajapopi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/metunago.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908b28f1e88---53700005907.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/42461396268.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/fopirebumatamapozo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78c937a84---16518757392.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d246814f20f---nebenanut.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/m3alk47v6lh3k67d45s98ba520/16973827214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=proxemics+meaning+in+communicationPDF 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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16524 bytes
SHA-256: 83602b31afe597b5031b31c13b9ef9d2040fbf7d0e8fb365e5725e6986129d61
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 10732 bytes
SHA-256: e40ad176cf3d4245ed5b11c7413a2d497a485caa36911bf37cbb0940d8f61760