Malicious PDF — malware analysis report

Static analysis result for SHA-256 7278165dd3cf918e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 17:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37da7bb495b00884f50984888b640a02 SHA-1: 6caf67267e59bba67973eb26461a25f5f9730fcd SHA-256: 7278165dd3cf918e010bc9a55adbf337c4222d36ddd994d07c4b734a228154f4
204 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, and a lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the lures and the presence of multiple external links suggest the document is designed to trick the user into downloading and executing a malicious payload, likely via a compromised website or a malicious browser extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • 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://thegioidongphuc.net/ckfinder/userfiles/files/xowufadugemupogefova.pdf In PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090519043610981.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139704b196d6---foxakubusu.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/bapuzejam.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/50162374609.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/66424283517.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jadavadubazudoje.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/51802532527.pdfIn PDF document text
    • http://nktrading.qa/file/files/13082804723.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/zubufakeloxozatiminagado.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/nozisafabufi.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/rewadunobemokanokuko.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/pejodikegisaw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ea29361e66eddbddf04b6dde0b400e0/22163012308.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161327cedbff2a---74740562792.pdfIn PDF document text
    • https://33mobility.net/uploads/files/21874374488.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/2754363563.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/laxorewivetapiraxipovuno.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/fafedimuzaniza.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/23034549770.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/51811111873.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/laxutipafiko.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wibifejoduretatugix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=internet+download+managerPDF 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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 10368 bytes
SHA-256: 93499181099f81e9ea22140333f240ab79dcc3f9e709a10597d68a39800c74f0
font_01_sfnt_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 16968 bytes
SHA-256: 8ec69efd8dd46598902ed26450b7ce36517b96a80c40deabf603d30661614dff

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