Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f0f5548e82948…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 21:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ac9e1a9e507e79484e10da35e4489c2 SHA-1: 5612c534fcac5545036a5582e51723e7cdd0bfe8 SHA-256: ab3f0f5548e82948bfe8908952109b285ebe7f8a4d66e6259a991df7231cc898
196 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 exhibits characteristics of a phishing and malware distribution lure. The document body is heavily obfuscated, but heuristics indicate it attempts to trick the user into installing a browser extension or update. The presence of numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggests a link farm designed to redirect users to malicious sites or download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://walkandsmile.com/userfiles/file/57930804985.pdf In PDF document text
    • https://jf-orvalho.pt/userfiles/file/65413092669.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f68b24e3671847bb724ab78bcf744ac6/dijejidowusixipap.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd39d0afe9---22498928147.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvisilosuzobezid.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/82305049210.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8725b785---66930531072.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/69864804359.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092a763cc6a9---fisujume.pdfIn PDF document text
    • http://yjccnc.com/upload/files/luvuboroduv.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8698c6ee16774f542f6cecc5d3639397/51119650368.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kametazekedopiwu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e18a4766f---bularedasowexosu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa2848581---37968553929.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55368422290.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/voropejasuje.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/j949cmna64f4buar608v8le506/8815759724.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/bogedunedefivirabulu.pdfIn PDF document text
    • http://cpils.com/userfiles/file/84047799812.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7a16857a918d89267337915b9889dc4e/36845711055.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/46443252628.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wimuramewaziga.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/xudurafinarotuwurejativo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c7cb414730ebbce0e64fdaf0e76e54fa/67620306287.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/lowazipoloxigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+emoji+copy+and+pastePDF 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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10828 bytes
SHA-256: 275af917c00051d4430f92d2acfa5402673c6f32b7ce6f391c0e35f74a5cff4b
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 17424 bytes
SHA-256: 5bb6c650ab64b928f219b699a34e3de41929672f3ba4ab563777675591c6c60c

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