Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4b9d9ac66c6d87…

MALICIOUS

PDF

78.2 KB Created: 2021-06-19 04:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d85edfbc0fb34c1e358547a9a7c8315 SHA-1: 0b8f3d1deee5c81adce57107ba127137a0634688 SHA-256: df4b9d9ac66c6d87b107d3f48856bb7b8c5ccabcbbcc80a0c31ed3d49c4aab93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=download+ppsspp+call+of+duty', are designed to trick users into downloading files by mimicking popular software searches.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=download+ppsspp+call+of+duty
    • https://aiwatopup.com/ckfinder/userfiles/files/27126874234.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1055a8e47---8860272007.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d17lgmmilm8nsh52t0laq150hg/maxawipevibod.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f7505d7f9118fb287630b2fc1fab6c62/78309543898.pdf
    • http://archi1919.com/smlclub-files/file/poseved.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b0e2b9434affb80472cf5cfb3afd770/46734475317.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c34254cf6---rumum.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bagezabanefegepidorarefon.pdf
    • https://emilline.dk/ckfinder/userfiles/files/jefijajanidogidenavun.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/12a3bbc0d62d4787a7f59732dce946ec/22606694630.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9d1426a49e6942dc22a49c982b53df56/zalavipopezixabosejonuma.pdf
    • https://ktmcollege.org/public_html/userfiles/file/pifejevawidus.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608868800049d---tufulemojepibepifofi.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/kotus.pdf
    • https://louvre.lv/res/wysiwyg/file/35709817653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd40.bin
dabe17b4d5b30c41921599e3fedebfce4fd5ec10f3f74983b90007eef62f3de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 5244 bytes
font_01_sfnt_off0000ef53.bin
eb5c18be607831b319040ac6bbbdecc09ddd143754b1b84dc124ea72dae6376e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 11508 bytes
font_02_sfnt_off000116fb.bin
3edc706225c94b236b03d98948a88fece3d4471aa3ed357ddaecbdd9d2c92ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 16076 bytes

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