Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604c2626a1e8c14…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 21:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce193688416cedf0c8783f3916b6ea39 SHA-1: cf5723565b71862440b86d08633750eacfc6fc65 SHA-256: c604c2626a1e8c148a53b90576f29f9b1d73f471d106fe13f0da40aaf353887b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://pistant.ru/uplcv?utm_term=meaning+of+the+word+cull
    • http://nhhs78.org/clients/63854/File/48866358659.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a51cf085dfee369f751be02ec7c0f1ac/tuguvalupokus.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24fccaa8eb---xazupomolorojuguja.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958d4e2b2e0---bivewiligedubolofumal.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805efb937b7---wogoxusunoka.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ucg5tv78p58u46f1v9lhltgcpo/vuxovoneka.pdf
    • http://stroisvias.ru/userfiles/file/neginawakolerogatugiwozev.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a49336f22605be337e4dcb589e77761a/14523165482.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc91b9ec198---sutesejodepuxekeretesezu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba8fbc201---dasirok.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2674737b---60893023756.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210625/file/16246035048930.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ec5be1d3df2c7d222b59ca9361434977/wilexodezaletujuxuw.pdf
    • https://mygo.com/ckfinder/userfiles/files/8169695039.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077632b002d9---14753749934.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/guxivunavumixebukokawopaz.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b946cb5609---mokositalafusalinifekivo.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2cf9a73e23f35782c0a831fc8727380e/kamujisamovoziwu.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ee4625bb---puwusebotovubuvatigin.pdf
    • http://itfind.ru/uploads/file/57083728245.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d762deb6dc7---juwiroguv.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16088587246829---tuduvovi.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7k7gnr5ggh8pb6j47q4d2pv2h7/71908326777.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0036f3ad4---42383039907.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb4.bin
340e4b6d3f994d6b8bbc1c8371efa46dbd44e956e911c39f1dab32a82676d76b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 10768 bytes
font_01_sfnt_off0001283a.bin
d68d7eb1307fa127d77f56803d85d059a4db61e5f9591ace5a8ec857d930e5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 17168 bytes
font_02_sfnt_off000154f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 16792 bytes

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