Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e6a6b2c0587c9b…

MALICIOUS

PDF

95.1 KB Created: 2021-07-21 19:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e43b0cdc0fd2b4e581a949a2401f0b50 SHA-1: 34251cf1a962c080bda8543843bf192c4976cda7 SHA-256: 84e6a6b2c0587c9b7a143406c0db26bce327f11a076eec8e55b8b32464aea69b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, some pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://vattucongtrinh.com/userfiles/file/pimuwigutovajezudije.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc1cb2f35---tigafak.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rfocioqsf7j2hf0rh64v8770v1/modisajivimideratezexexo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a070d4b9abf3e59ec800113dd4a57612/4052421125.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wokadumapisexetuge.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4baca1b25---mimekokajopakuxasiv.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf5863660---21646212889.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/48910912460.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4cede98efb6ddfbec6ad4a4b300c593e/fodenivo.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/17146397422.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69b375f60b---lomudipegebapojelusudag.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/33326133326.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/38d5edce28a8747fdfa27956cf69b5af/97398622433.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/2da065273deed3377f7a59213904f3ef/38360592436.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbb159884---rulinozibawunev.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0215f685c8---zedifaramagorujero.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bea48732---bofigemezotuxetu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nidigusebepitarubani.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cf692393b1dd22ca880b7cdd68e6a94a/54526031823.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/filepor.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/27060632529.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/73c8e1a264405bc45f8e54096a6d2154/piboburolapipumurufinep.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zupotemu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/737c6c0f5fe5803ab51879b7169a9042/bigobubofazumituwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+private+server+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 19056 bytes
SHA-256: fe470f8d429edba6baaac80c9f013e8ca00176ba8331996508b51a0158be14c0
font_01_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 10992 bytes
SHA-256: 768828a44e11b80b37e29f0d7bf3b9e10a51723406821127da3a64181111551c
font_03_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 16664 bytes
SHA-256: b1908eb7132dc5e23acbb1ed1ed7ed29cbae9bd49c52ceef8edaafb9f9623fae

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