Malicious PDF — malware analysis report

Static analysis result for SHA-256 741528bd90ec6e6c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a309e466290163cc4d300027060d20e7 SHA-1: 4627c1ef26332c42de24b893eb6d612dabea7352 SHA-256: 741528bd90ec6e6c01beb2efe12491728921db684200fd45baed2a527a509b32
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised WordPress installations. Heuristics indicate a lure to install browser extensions or updates, and a visual download button, suggesting a social engineering attack. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=merge+pdf+online+docupub PDF link annotation
    • http://haisushitogo.com/uploads/files/nonuvuvozed.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/54997306983.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/91883058363.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/pimabumeparut.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea326a3620---luloganipewuwejuf.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/25037235844.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tonokuku.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/46226108050.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/wimenam.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a08cd3ca---fokamumemigatovumarajori.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f17275f5c70ab416e79663ff0fe35c12/5480465425.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/966eb70441fb328ed6220f1c7e31ed03/gobupunopomi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8399d6959c---43234667387.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839112269ac---kesipovuvowimerozepew.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb45a646b1---xukepijewusumisemadosene.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/wejamewukomajojewekeva.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nibodiletifisapirugawofu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/kogebapemofefewabax.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/65093647913.pdfIn PDF document text
    • http://www.asslar.de/downloads/pixoxoxetaxerikopofileram.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7288477543---jawejuv.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac44c149740dfdd9a2291f0995031457/30954051371.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 10600 bytes
SHA-256: 3a88e2223a99233760d8878034163a8c24bbae1c111a47eb93e79d4eb001e8ea
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 17932 bytes
SHA-256: ac5611b2f4a482cf2234c91c0497a796f02a25791dcc37f16ab9a1ed501c838b
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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