Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7237f0f1dc58ac5…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62e8abb74d9165c5bd6dc1e5e51e0b85 SHA-1: 7b0b5d33ab00eb9e27f29ac7b58e8dd32f527a22 SHA-256: f7237f0f1dc58ac5cfffde8552c2ebff4c4ce6af2889ecdfcbd41ec0d515b2e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to external resources, some of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://flour.co.uk/ckfinder/userfiles/files/vetubev.pdf In PDF document text
    • http://kpdb.org/userfiles/files/26812068706.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384ef4c1a54---fanusiruvofem.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/85049367823.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b5e607988---wetiped.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/dilarazerasulobaf.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/busus.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/numivu.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/29718497701.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sazugatukigosugo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae070d9aeba1b2e382d2145a51e11a54/sorarivabawatubipizix.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nutaditateradazuw.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/68429140576.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/55069454817.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/zazadu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/29800906899.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f24e14a4---13906829603.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/30525609632.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/211444435.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/19086146902.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/93323851910.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/43308575724.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/51415801436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+messenger+without+play+storePDF 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_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 18184 bytes
SHA-256: d5a6adedb37caae30accac710968ac3af1dd7098365bde6b7b1450eb92736b04
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 11140 bytes
SHA-256: bd396e673a63a383bb1795941f0327ff2631017b805eba884804e2fb0c043c3f
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1