Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd51390fcd3b95…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 00:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03f85f14a5b9e511e6d5a56baa2affb0 SHA-1: aaa110a827cf30f2673f024648db6d597f518751 SHA-256: aefd51390fcd3b95727a23c436b1863fcff38e6e64e020b3c78eeec432a99fef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and URL patterns suggest it's designed to lure users into clicking links, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=corner+bakery+nutrition+menu+pdf PDF link annotation
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fe37k1ec3ba1lttbn4hctuj2cd/30805033304.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/85965105331.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/34279413949.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/27929728692.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b25cee5450---gegedizafedimosopaxamizek.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/u7osplaamr47rg8n0bccft5fd7/piwaxebofebuloluvi.pdfIn PDF document text
    • http://etnorom.hu/pictures/wopomazijowovigurex.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/gobomasopoturoxuwozopodal.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/344f19a987b0ed64c3e175664223a342/xoderenol.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/16510808439.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9ba5a96c4f41a14fbfa5abd2606d1fac/tederuruje.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e5134e48---jurexi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/10546217900.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/qe0udlvsmjsqra21qb4pietmeb/89889952366.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115118e80d8b---migaguzoseneleretubine.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097067d915fb---zoweduvotibevogowodirof.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102b5fb68f72---waderumaranu.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/dojatukusazamareb.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/dogepizesa.pdfIn PDF document text
    • https://rajakedua.com/contents//files/papulamuzerobazabax.pdfIn PDF document text
    • http://fkhd.cz/data/img/dubiwopufa.pdfIn PDF document text
    • 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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 16640 bytes
SHA-256: 2a75d5163825c8258d31a600124258a1bbbe144f06709cf2a87c9dc85d7e93a7
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10924 bytes
SHA-256: af900007bfb03744c3d108bc5fb1103af8cc7c3a60833f2f7089dab5a7da2699
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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