Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddf5332f86096df…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 12:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e6e5c18cfdcd4392633c55b768c4f2c SHA-1: c1aede3d52f3a792cb018534e154ecce4dcbde39 SHA-256: 2ddf5332f86096df38240b4b198979e4aed91011e3b1e2ac95b2e6f26c7528d8
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and potentially compromised CMS uploads. The primary purpose appears to be directing users to external malicious content, likely for SEO spam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • 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://mariellatriolo.it/public/file/remexigavubilifije.pdf In PDF document text
    • http://mosvag.ru/img/lib/file/pipaneze.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/34283354371.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/87842447341.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/94713779594.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2729e9b3---sozomonazadiwigus.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e35f5d7e1134ab2ea7d05b0e47567bed/pomadenefubukatojutixoguk.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/nanige.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108061407311002.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caae635776b---minowasenelijogisoj.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/25929870023.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/reposowufonajebiw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fab4923d3---gejejowonujijanut.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/16446279242.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/56360945538.pdfIn PDF document text
    • http://erex.hu/upload/file/9328402975.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11d955148---wovajagozagezuxexevalebid.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/270a975a19c030ff879d01a64a40168e/voromipoxuviwiwurinez.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/takonazodunumaxiwa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe0c7a00---31943549167.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1o0l0lnnmi60rvm28fvbb2377s/joledawonawenavuxewobu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c16964104e0---98799282142.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sazojigapilum.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/89992070149.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609906de65730---8658348630.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///wekijiwagitorezobipekanir.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5008cf5aee412bf3e6683ad47ebbf47d/rukimorugofepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+omega+ruby+download+rom+3dsPDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 17620 bytes
SHA-256: d889fc2ecc4dcad8b0a81a940a80d25c4b6b2fc27257efeab88d631f8b1157f1
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 11104 bytes
SHA-256: ec39ec75ae5fda16f7c15857a7717be0cfac423cce7f92e6640d6fa6b7baaf38
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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