Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c13c4a828d85ca7…

MALICIOUS

PDF

212.2 KB Created: 2021-06-25 04:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0d441c9d8b46b30aad9df4ecf27c234e SHA-1: f3c44bcf57397a4ae81d15924b18feee1654b4b9 SHA-256: 7c13c4a828d85ca7fed2f191f58467b7b9d4670f12131e6ec23e18c3ecc0de91
66 Risk Score

Malware Insights

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

The PDF contains numerous links, with a high-confidence heuristic identifying them as pointing to compromised WordPress upload storage. The ML classifier also flagged the PDF as malicious. These links likely serve as a lure to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9749

Heuristics 4

  • 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.
  • 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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835189a7a40---kekogixarof.pdf In PDF document text
    • http://zgkimsteszew.pl/img/upload/files/31092924473.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b2da6cbf705f18821632c82578fece1d/tulosop.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/645c65cb7460eb01aad5b54fb2a2ba85/78389811196.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bs4q9lkag98ppbe25shchnpumj/petozufurugodakakexu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/91432355627.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607349bcb8748---48617097620.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cf516d561fe6745c93e0f2f5c091a926/43157820363.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae3f940a87a7f03fb5e9f94f33aca999/tojosibezisiw.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaec00b514f---fifuvolosebarurusikopekag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd002e3c42---tuxolorolada.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hlkcn01vth5p02m0u40ntumuv6/77659182980.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/17021442649.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fb2bdd348897e9db522871b4f6b25486/39635319366.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2d8aea569a158c2c6d3bfc925bfbad3f/lomelubolaget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=trumpet+methods+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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000326d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326D0 17660 bytes
SHA-256: 7e102b9d9014e6f03d225c679b1e51d2cca39e6e05be746e2ef12b414b5d33dc
font_00_sfnt_off0002d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7F8 3372 bytes
SHA-256: 8c9b692632bb0a10d1b3166bb5f65510bbdea6d17183ba334fe5647854e19288
font_01_sfnt_off0002e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E400 4988 bytes
SHA-256: b442d6433719b764fb8cb7cf98617e1d301abd686f71678b10567966d7beac64
font_02_sfnt_off0002f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4CD 16128 bytes
SHA-256: d612948274f7d08d2c0b01f4b7bec22e05a57ed7acf8d542012c2578afb0da40