Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f433da41980b2f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 01:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 825e9196a9d92f9202c8aa86894e9462 SHA-1: c0ad97752f9b9ab95cbc657510789b6498b9dfc4 SHA-256: 26f433da41980b2fdaa04054746674829a5720f843a9db320ba159b6017c040c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is a phishing or trojan distribution vehicle. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://dentalweek.eu/userfiles/files/91285913112.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d220e522375---julufetufesuwila.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bff494db0ef---57429938951.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607153b692c4c---31780011463.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d2d2a6e55---79514597249.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/78427977042.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e302c1147---25353890899.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0859378001626845233.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/benurunatiranivojumij.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mowurifineberolepa.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/tikonezakugikawu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/9871650646.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/vekexenuloni.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/2443520613.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/25907402763.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/17114861857.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/9403775785.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/8102895648.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/78446121029.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/worusak.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/fesagi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f450ffa2---66989484466.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/tubabufumekuwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=skindex+16+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 2520 bytes
SHA-256: 8abe7ed6d2c325407b6490a5e428e7f7e1087cb6a99187f47edd822ed2519303
font_02_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16620 bytes
SHA-256: dc6609b18637004b6390535c5259be90bdcf3c5059f932bd852f58b733f9e5b9
font_03_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10284 bytes
SHA-256: 7d2d66e9d790ec03464f23e4d673e950eeeb17c8134f0074a5ebbd230ba32185
font_04_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 23892 bytes
SHA-256: 1b4487330c531186c7c446d7e308896093b2bd0e78dfc0695719b53f616f9606