Malicious PDF — malware analysis report

Static analysis result for SHA-256 026435c124c2544c…

MALICIOUS

PDF

94.8 KB Created: 2021-06-27 03:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e4d3d1864e3376a9c005412702ff0a7 SHA-1: 416dc180a16b2ca541d5db3bebe01bf6ec87e9d4 SHA-256: 026435c124c2544c7e341db90b2e449612039f3e86f5ca50c8ff12d772ec0bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://efsanepin.com/calisma2/files/uploads/4118250603.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d31d9179f1381c8ebba4aeabfd70537e/zukiwuvafetevode.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/kogefesukowomix.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210602224842.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdcdd4234---depadonugesop.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06c121f10c---41416277210.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b9befbf0d81f86568a3f052e035d17a2/26183466537.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f2fb0887---54558811911.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756243c8e2a---kutekodobepada.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609471b9a2ba4---31805686837.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a26f1351ab2ee570df5e04e9cdc5fa5f/tidezanijave.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/30b24706c53570ab720ff27e4aa9ab17/foditepopa.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/daa1a83c253d3c603698e63ba315ade4/99027991427.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215202316234461.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a8a7233b90664541163d8dda2983831a/16780421956.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/254e956e3afb6881beaf548f42f13ac9/kuwizizejijijeboxoni.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89tpa5j0gacujd49mtr4p5mps4/zerigulenog.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210613125510_4eczje.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c66dbbb315a9507ebd5b8242e4df9842/55763986878.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/9266821535.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/88621125208.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/800bc14cdf6f593d4dc3470bf67adf03/18676373949.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2300008451---53148243459.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2fc24ee89---wirokopekotibasevusuzede.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mrf5k73fknavhgcr1qpd26crl6/bemifuwamugogemidalelu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a120e7f5f---fazadax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=organizational+behaviour+case+study+with+solution+pptPDF 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_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 11384 bytes
SHA-256: c304ac315870aec5c73f5ff892e53db165c5172fd4033405c46b0b8d4ae1b383
font_01_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8F 18008 bytes
SHA-256: f3a05604d1b2ef754f549b6ff12a8b3402a9cf50250dd6a041bd2cd40367d0c2

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