Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e370e1694cfc9fe…

MALICIOUS

PDF

84.1 KB Created: 2021-08-27 16:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2d3bbe90c8b039235bdba952c194ed14 SHA-1: 8cc5a4d56e1d6be7d5c5daad10c283355d54e88a SHA-256: 9e370e1694cfc9fe9758829a16d071a4b78ac54ca3c3d340acc153cb7007a4da
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised WordPress upload directories. The presence of a 'download button' heuristic further suggests a lure to download a payload. The overall structure points to a phishing or malware distribution scheme disguised as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sushiloverca.com/uploads/files/68561964279.pdf In PDF document text
    • http://ahdjcm.com/upload/files/belepimijirado.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/bufutifotigaz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890d5873af8---zomubupezuvavuberod.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607588b4aec21---56060698362.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/55484790298.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160be60b36c76b---21435918423.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8ab99131---87918284140.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/soxizatogulopiregirene.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vutedogenumakugojoded.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/luliwodudatuk.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b31006abf9b0ef72f39fbeba889d75fb/pedunozevajarifevivo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7dccf0b971c155dabd5169914b974329/5163199626.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/benumudeliz.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/81631209316.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/o9k86esqdm9tqprfetdhp9ju34/sepawisemenizidike.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/waxenokudojaxifevufedu.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nelawuxoxetogufulej.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8jl66i98t74f9rphbjkg6u3pe7/naxilimogofim.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc9cc1c6c---fopipafevi.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/tutafufofafamiv.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/57144104189.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a90c915563b4a9dd13e2c35e5de89978/96268310598.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c4ec80c5900aa904d25fe7dd73e02352/nunumonib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=james+bond+casino+royale+full+movie+downloadPDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 18976 bytes
SHA-256: 36e86bf000a7929602ef7b3a4a5685ea5c4e473566a5fd20a8ebbca844444407
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 11036 bytes
SHA-256: d7851cfeb28f57509ad9930f19c59235af25f0b26d6f155d52d24528efeeabd8
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1