Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e66fca0ae6d6c1b…

MALICIOUS

PDF

81.6 KB Created: 2021-07-31 10:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da9f4903d497a0fc14c1ca70fbd25703 SHA-1: 4cc90a71085e98bd97080e124408c76757fe2391 SHA-256: 9e66fca0ae6d6c1b6d0af5f65701fe31938d371ccbe79e1ded20d718ef15ff2f
164 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. It functions as a link farm, directing users to various compromised websites, likely to download further malicious payloads. The presence of a 'download button' heuristic further supports this phishing-like lure, aiming to trick users into downloading unwanted content under the guise of a service manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e2361460770c90953cca1291009b6745/zivujagumipakinuxapa.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f9666a8d---nefovofetabafodo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6e60bfc199ec76d7de4815e7fdf9787c/luxefusipekikofetis.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a210f464101---lapubebebufovozagekez.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/44746037874.pdfIn PDF document text
    • http://pasted-radio.de/web/files/33558904977.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/zajewinivulikoxedil.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/61e70f274e3b278cc8deb33fe646b7be/49049678697.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/59951383113.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d3a66a25---rusugelitijewe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2023949c---32402693428.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e65556fbc2e454594baca7e0ff3fa217/karuxoduteden.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adacf0050---43894389325.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf9b950378---47862219854.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nugemetutatuv.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/32504839143.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/59190935684.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/safasakug.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/goxojufirawoga.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4e1bd1c1---jedezesizega.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ded0rdmm173fn9qld74d55f44g/zuvepiborobuvidanujadu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef83188021---34177140680.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/jigosaboxakitijinetukoxag.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/52366313108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cummins+kta19+service+manual+pdf+free+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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16640 bytes
SHA-256: 4cfbc7949d624caa604db015a8729c2bb328a5294ed16b74d518bb9fbe445e1b
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 11376 bytes
SHA-256: a3e96fa38a889d7fb3bd5764611375807ade34b28e34026061a0e362bd2d2d96

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