Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c247115bfb9536…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 16:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f64b45c670325fa176ba7629d894882 SHA-1: 04c86a10bdfae54d42ccad75abcd0470a9c43da5 SHA-256: 17c247115bfb95364c8dcc3339c883760a8e4ce7564b384c73d485c65d19d8bc
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains embedded JavaScript and multiple external URLs, some pointing to compromised WordPress sites. Heuristics indicate it's a lure for browser extension installation or a callback phishing scam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=how+to+log+into+my+icloud+email+on+android PDF link annotation
    • http://cdkuys.handysociality.com/upload/files/bawilegewub.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/58473512013.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/77285150644.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/6594107977.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/wimunufibemegumunofal.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/79594126283.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/nizewigorife.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/28388546103.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614190b524b1d---kaluv.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/6829963588.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vimipinufogazonifof.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109171310127695.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wejesimisibukovuxugufopub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4db05d8e92a0a4dfe05fbefdf7a8658f/66704470203.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4209b5d35---10680469988.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/talominitovuxani.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/57218278272.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a27c0cfd---zatabirazejesugagutepipam.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/50072797058.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5a47e423a5b65f98509497dddc9a7fb0/59672671708.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mosurosudibalojurime.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee31a1127---53700610340.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614150a101078---fixug.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/65113520278.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a1fa3bfe804e54dd1ac77aaacf361bd4/38608749153.pdfIn PDF document text
    • http://fruitsad.pl/images/file/zufigigonadorogitiwupi.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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 19476 bytes
SHA-256: 7443471571526fc6786636cc1b4355f34058c12441ddb2184d4676f2d360a9d3
font_01_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 10836 bytes
SHA-256: 6d34f5e2ec02e14e586c26f374d6e838c74b085cb611b753e24cea6bc42adde2
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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