Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55279cd7bb973bf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 09:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71e24ac9281330d819df6b497d2344ea SHA-1: c2768800252962bff970af5230577c51d65fb419 SHA-256: c55279cd7bb973bf2211ed6cc7d796be2cba3c146ad0e9a97fc773ae36bac540
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggest it's designed to lure users into downloading malicious content by posing as a necessary browser update or extension. The primary attack pattern involves social engineering to trick users into executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=placement+english+test+with+answers+pdf PDF link annotation
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/046d58ed3bfceca24da393b57c989537/25992482457.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/94559171487.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/56999283638.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5c52acf91---34238618171.pdfPDF link annotation
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607194b56d8a2---40074956794.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e35c5a0c19d5419d99c86b9d9be5c2cf/keradopusedaximato.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/mamuguralazorevo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/34160112599.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/96620205341.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/vuxagoxofiv.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/wodupelaviwaxedijufomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d69fa6f7c---52797967498.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ef161b8a---jobunufiget.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/79333991470.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081e019267e9---fumoga.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/52930144153.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/leduwokaxujonurave.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vujerenigiz.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/60112766027.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/25210341256.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967712510cf---95915566946.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/3660809856.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/wajisawaxovogizadol.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/08de9d67de8518485a6d0e8365e1347a/48887282674.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 11032 bytes
SHA-256: 26eb00e3056f4d3ec5aa8d49e0b1eafd3f3fe919f53b82190b9593d64cecc4ab
font_02_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 17428 bytes
SHA-256: d12fdb95f8c075146c24bb4a6cdf85d231fa958563059a3ee75d153c01546e2a

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