Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9974e9961c2a54e…

MALICIOUS

PDF

100.3 KB Created: 2021-06-30 19:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0dcd51d6546ec811ba1e682f0955bbf SHA-1: 3a1a444545741760a80da47da9f50c477153f4ed SHA-256: c9974e9961c2a54e89b8ead6170be00bcf54af7d9e7a567b32ecf2fb8dc359f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5001f207---65022086699.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608373d160567---baderuvoku.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/solab.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbad07563383ca219945dfe666d188be/jezujula.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609893c2b61a7---bivobinijage.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b0dcbdc1---nonabozigip.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609042355de64---denipotunasa.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5df5ae991d53da2739f602406cf2074d/41120806706.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2474b5b342c31d7aa0ed0c8f129e11c4/fatoxizulijo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/226889898.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0bb6f8eccd507308af9a10d218a00831/81313573268.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2875d624---32933712151.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/akq0nos9jlvjthkg4e9da159nl/65464957020.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff4dcfb1c---29920591100.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cc13ff3314cc49cdbc84713e05a5902d/jemadorusisu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/c05bd58ac9f63f04f647537c663b05b6/69311428207.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccada76ab---96211916455.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f08fa2982---zawitamimata.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/32849618131.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528042327.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7fa084fd---rixugukidenewedaxo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rehn9s85asjc80757v39olb1o2/voperi.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/domebemejijeg.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/88558107575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=medical+term+for+sudden+drop+in+blood+pressurePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000106b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106B2 18576 bytes
SHA-256: e5dca634618bbc328df0d868b25693e97ff9701f4a02a3601b1cc7eae97a7c70
font_01_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 11012 bytes
SHA-256: f2a63374e0eece9ebb6b9fb4c47ccc199c18b0e785fc7535e533207eb0a09e2c
font_02_sfnt_off00013d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D89 17472 bytes
SHA-256: a207420b771efb12f4ffa3012a54224dd518f0dd483429162460cb4ce430ba1f
font_03_sfnt_off00016b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1