Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b92f0779c48f18…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 01:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89bea8f072c822fcb72039d856becbb SHA-1: f0b143741c61bfc511fd4a0718af96b3367977fc SHA-256: 81b92f0779c48f1888f6cedb730e30c66b98c3dea362ea3cf4ed4b0ade742c9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://app8itebarandgrill.com/admin/images/file/96344327459.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b39ce1df65cc262a417b038b986bf1f9/genebufen.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8527e62b---79631395951.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8925fddc1bbe61cfdf3e534be696fd32/99381170220.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422b571c6e---vuxebukubajeweliseta.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fbd295a996d371f00e915cd28c2b8804/50203983297.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aab52876bc8---153150038.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739db1838c0---51901858100.pdf
    • https://nikosdimos.gr/userfiles/file/67330780488.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2e56b9f83967cbcd93e44021adc78459/vojawedopapa.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60128321e---botidu.pdf
    • http://adaviestransportltd.com/userfiles/file/21262760266.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/66810371794.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db24f995---kurobumufutijibegu.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fb697ccc---kububojipesukelamuvezune.pdf
    • http://llux.vn/uploads/files/89309794972.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a7sd1aj0u1b4nemdlao9euf4d4/worazabezuliduzav.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/aecf4e1852887a437ded2b79cebdd558/60361651964.pdf
    • http://ankaser.com/userfiles/file/rafutigugadilugefov.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e48a1b3f3---pijide.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/26455827122.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/03536281d69901a2dadbd08df6448f77/vuxikujitufidedixilenebib.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4253f744---pevezaziveguwabe.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///202106073257_621624850.pdf
    • http://thepokewave.com/uploads/files/lopikan.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082839f320e5---mesuso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=new+year+message+to+my+lover
    • 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_off0000ea74.bin
fa3231582b77a41ed91894a2eb4749be407891c08da05e43dc82937e1fec73d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 16664 bytes
font_01_sfnt_off00011563.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
font_02_sfnt_off00012d7a.bin
43585005099026070e6a35d9940552e20ede1fcb22c0a6b166d168af8b4849ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 10496 bytes

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