Malicious PDF — malware analysis report

Static analysis result for SHA-256 90345c4445dfb99a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5dbb05c05be8b36a1c820aacad1f7eb SHA-1: fa47cb532649d7621281faa371bb581f2cd78e8a SHA-256: 90345c4445dfb99a18596f98f6e3ee48e2146315ca3618df0da79376cf78f87a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The presence of embedded JavaScript, coupled with the ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests this document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The embedded JavaScript could be used to obfuscate the redirection or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=android+assets+folder+example PDF link annotation
    • https://absoluteanytime.com/media_file/files/files/xazure.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0038d830ba52948fc2d81a5e81b57fc9/20998679888.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/sefufusomuju.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161354deb7efea---fafamufadoxazam.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/73369735415.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/tejavul.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0ghf454hmpmtlctoaf52dd8ged/mejebixavok.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a820a8155---ximevokutusorelim.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901182459.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/64217203935.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/53769969931.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdfIn PDF document text
    • http://journeywithmypet.com/ckfinder/userfiles/files/gexaturojot.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/24585730651.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c77ea77d4846d7edbe0470489db512d/beriborikizolotefenutivuf.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c9c86c0c556fa64f4c6f5a973debc55c/sofejaxaluvirutirali.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/damoxuwurilativemaletus.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/setusemimubepireli.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468d770c2ed---dodupajoter.pdfIn PDF document text
    • https://gornjastubica.hr/files/dusidiwola.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/20729119170.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/musefafinarogo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29c55982a708cf043655e5af4f88384/47380683213.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d1p121ead0asetuje9etfmo17i/14411889601.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140817b5779a---siledelukefifalug.pdfIn PDF document text
    • 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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 18460 bytes
SHA-256: d21fcb380e318922996d4e6a1c92554b925d490b9944e3045e45d1e97a692f6f
font_01_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 10740 bytes
SHA-256: db1c4a4ed3158aabcab19dcc9d5bd23342ce0b6fe7c7d0ce83ddbf3ce6487ff0

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