Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f3522fe6aa6e4…

MALICIOUS

PDF

76.6 KB Created: 2021-07-09 06:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a9ef65d9c48bb989612706944a9e41ca SHA-1: 0b14a55df23fc1d967c87e742b53b300f75175fb SHA-256: b38f3522fe6aa6e40bafb5983dbb24ff7b8737e21872003fc2b8d39dc42a48e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dab47d1f---82058287087.pdf In PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/megazelugurodokifeturunaj.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/47548973462.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f124ef17d38765f4983603597c68329e/dofutezizakilefenuli.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/2428946156.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607506f247709---fodaduminazujapawiwubixob.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828acf21412---kefiralarosotanu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/93606dbe2216dc5a8b048bdd9640149c/77179860205.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b4549eee---tikirijuxunuferewezebize.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/narujabumaxifebepasot.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf4a46bb5---puweruniwawop.pdfIn PDF document text
    • http://freeski.hu/freeski/file/32677962748.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/9446224097.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/66432573511.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f183e15c0---59895263859.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/58e507a7ef0d514aa7c487998b45b1ca/gaginoduferolevo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2a2bffb4---kerafibuwimejobi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/98029211165.pdfIn PDF document text
    • http://vinmexindia.com/uploads/laripivusatuterasosum.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8deac16f1674ceee92b9c92341785372/89870996977.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8927292e3---ruforiziweki.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rg9ka6ckngu4nesbiq0gmejgb0/bemuvuridizibarawode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=damn+hot+meaningPDF 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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10244 bytes
SHA-256: f6a69f3d451db866a6e11b65f4850e83745ea95d0f6ab82a7e96b2aec0351453
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16660 bytes
SHA-256: 54af4ea2b65bb0036fd83cf6eb04ec9f163d48573c9fbe3650316b292003d1e3

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