Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dca42b6cc08fdb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 10:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55b5683e4847403c00c3ab28c3304d19 SHA-1: 01e439da2da9cafcb29be367ff65c1dec8d9dd60 SHA-256: b5dca42b6cc08fdb27e21c6346cfeb2617c2482cdd9b7bbf0e61ff1a68efacf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://855solution.com/htdocs/cljr/data/files/fideboleravajoxuvukubuw.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/58144316603.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/78148763991.pdfIn PDF document text
    • http://pk.mo/userfiles/file/65493012480.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/82892788624.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/41888926222.pdfIn PDF document text
    • http://thongthien.vn/upload/files/80793284387.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/76686939364.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4650d03d3---10320125788.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lomesobubopuworeju.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/daninipejibep.pdfIn PDF document text
    • http://htygroup.com/upload/files/miluropaxilalo.pdfIn PDF document text
    • http://midospa.com/upload/files/telogokogur.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/resomabel.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceef751d8---bisixiposizefunakulinesi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173e25e30b---kofixavobiteva.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/45079665458.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/megumokevuputawedanime.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/46680195823.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gitapuponima.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/16106195061.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/86888969192.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4b90c1d51be37c48d85aabf56f10938d/77578014853.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613538135e55e---12069975803.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/59303786037.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/buluzewidoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+nutritious+is+spinachPDF 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 17664 bytes
SHA-256: e9e59339112be899fd98ebf4e9a74208095c78c9f3bb8e02a96ba09da69e6703
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 10468 bytes
SHA-256: 008602d257f168a9e737c7e25a34f95e7e23951d5f0b25d4e903c4be34ffe44d

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