Malicious PDF — malware analysis report

Static analysis result for SHA-256 92305be48ac2bbe3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 15:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 206d35e1079c518dab481f02317a2bd6 SHA-1: 70043588063759b06632524a9963e305e9cbe5ca SHA-256: 92305be48ac2bbe3f0df2676d1402bc1fe7eb2aa9d0a1f1426e0c445e780e22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier also returned a high score, indicating malicious intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=nitrendipino+bula+pdf
    • http://peneleos.pl/userfiles/file/zamepenasefelemijuwepin.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/lakigikebuwifakedasuvi.pdf
    • https://muacash.com/webroot/img/files/67287294525.pdf
    • http://brandiassociati.it/userfiles/file/xoluveresesesifegupakoget.pdf
    • http://metalzilembo.it/userfiles/files/4962926477.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bea594aa8b---18302623661.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/79487816989.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6d0c7594969cc32800e534577067c165/gonusewebo.pdf
    • https://hazeloyun.com/calisma2/files/uploads/8760022946.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fb833e7---25378935926.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12fb351618---diruxa.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10bb7047cc---ninivopejiva.pdf
    • http://p-energo.ru/content/file/fupopube.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2777b82f---38672916636.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210722_F3DB85A5D388F101.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610b192f4bc5c---nedumofinovovewamuget.pdf
    • http://vksraja.in/fckeditor/upload/file/bafij.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9eed8df3168a9413b10c25572996a5cf/xagonokomutididotojumuvik.pdf
    • http://reelproductionshd.com/userfiles/file/75527340685.pdf
    • http://titadoorbinhduong.com/upload/files/87209169462.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/76629891726.pdf
    • https://cargotavio.ru/files/file/jepebaduvatevoxuvipa.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/56832128683.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16792 bytes
font_01_sfnt_off0000d398.bin
408f646fa5079d69280f27f8dea93642e3fd0d0fa238614869bdd26a3ff36828
pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 18088 bytes
font_02_sfnt_off000102d1.bin
c6ed5b7199ee6e6630d117e7e01761ebff3600bf540e041c84d11317d7e70590
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10540 bytes