Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0ac273cf320c64…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 18:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2068b6b1105da3d24b7da4d19bee1e69 SHA-1: 055da6ba1069f96383fb1140792ba73fa22459ad SHA-256: df0ac273cf320c64e776b0212ae193d1371c674e4511bc399717ae76f0c47c41
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://exosportsante.fr/ckfinder/userfiles/files/55298206050.pdf In PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/kabodozujivub.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/58705265022.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/86526814850.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/falewexaguvizafur.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mjd5ib1mju3v0n4s3llv6lpalf/18512702884.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210524224839.pdfIn PDF document text
    • http://anpo.vn/upload/files/kemelov.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a059aa738e8b071b5e81bb6fe3355b47/pidituzenodinizigamuxenig.pdfIn PDF document text
    • https://arerp.kr/data/file///22724326588.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e2503f6bae233ee93264bcc88ad043da/18971674465.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/62f9fd47a12950d7ea8cd791f290af54/48119242166.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/nurokugexar.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ce6a894cfe6d74d620499404987c7853/82852875349.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fqej2fon060id7p1m936trqkej/muxanomegaw.pdfIn PDF document text
    • http://519pf.com/userfiles/files/70934409801.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186aa9fc50---ruxoz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/521bcf5832f5e0edcfbfbc3503ac1c08/fitoro.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a35c618d7716758280e344e405b27a60/31835048341.pdfIn PDF document text
    • http://ymmicro.com/files/files/43328630439.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/49479172200.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ea4b12ed---46251977820.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/zemijofakol.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca882169f6---judadena.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160949315909ac---ritexorira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=converter+de+pdf+para+excel+download+gratisPDF 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_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 16748 bytes
SHA-256: 9e1a0388eaf8a4630c10499ebd33b42dfd37c0c8982109e21634517ea2749591
font_02_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 11080 bytes
SHA-256: 25951eece3835ac09a2f9d69dc5f6e55d1d5976fca262b77a8c0f38a500807e3