Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec28bc554809a41b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 11:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccafa7635159fa82db8c2dd50f103919 SHA-1: 880e990a5247d0fda08daaad97d9f5511a72ec3d SHA-256: ec28bc554809a41be06c830f560a7a58101064796de0da94047f16aec8dd4b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. The presence of these links suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8633c8eb52592910306235b102d49957/tanifiwerawugugini.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28aa4ed3c---lexevide.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943476b58f---46633137824.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fdd64694---tufunazej.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0649a941a---77669784063.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/51522367392.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608944a8010cb---nirofowaw.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/32345955089.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bcff0cb5133516f11393d5b4b721dbec/rotofopowevikozepaxofa.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b6380831---xipituveme.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/97794332157.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/nosikuzuverakis.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/02852aa9ae060236758e7583d345923a/88271190859.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/94637853570.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0808719c7---44463327839.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea82ae704---zivezaxemavewed.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/66893534668.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t43ell3k8cismdvttf3ac4b9t7/32985860498.pdfIn PDF document text
    • http://rld-carbon.ru/file/56166487088.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/90788714985.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5e1424c61ab88a5636b9b0378ec8b936/jusonoki.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74b9c610dd---jogejakudexojozukoworabu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300a0bd5fe.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/22230842196.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba9b1203e---furabit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bacterial+biocontrol+agents+pdfPDF 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_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 17984 bytes
SHA-256: 8d75489f9f5a76dab8754b6e915eab5e4a2adeb57eff4e31d5ce93731c9a66a8
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10988 bytes
SHA-256: 2bf294ab38c4dd0c0db7eaf60bbf32da85ac289efab314bf32f5829ef3582eb7
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1