Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1655f9d204f1f…

MALICIOUS

PDF

81.1 KB Created: 2021-07-03 13:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93acb3cc9dcc8d6b4615a6d7c9b8665d SHA-1: 3bd3b182ae102d13795966132e42ebd65e52b838 SHA-256: 5aa1655f9d204f1f0198bf0aa9bae3d504727c627134c19bfd4cef847233ec30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://tagoproperties.com/ckfinder/userfiles/files/56049485351.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d8d746656ab14859b543c6f21dd31053/pulibofexafokugotam.pdf
    • http://iphysiology.ru/upload/14973415147.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be4aba63610---sojafowevusajerapaletexof.pdf
    • http://gorisum.net/fckeditor/upload_file/file/kipunujegu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82d048942---57023686709.pdf
    • https://bwawarszawa.pl/upload/file/kogifomake.pdf
    • https://lawina-radom.pl/files/file/gemifopekabijazera.pdf
    • http://shinies.ru/img/lib/file/24634162520.pdf
    • https://vestol.bg/files/file/vexojagasobowuvo.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/655910ccbaf82ce6fe811c5a6e6f98e3/74373205992.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/921276a49c71660ad1522dd2e4780de6/925816933.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0496ab229d0784c0e5440a7a833e1eae/liwaxazopux.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2663c60420c2c3ba26b62232c80fb9c5/mapibepunu.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a96db62bd9dde901a73ec9ae0962c869/47323940801.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1a60fc72---82639178880.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/85537717936.pdf
    • http://alarcon-v.com/editor_upload_image/file/ravenugixugab.pdf
    • http://parfumerieindex.nl/images/uploads/15400457667.pdf
    • http://architettoseneca.com/userfiles/files/15530387976.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f6aa7d91bbbab5ed5c68870ae8d7ca84/jilixefutafokutigu.pdf
    • http://akwarella.pl/user_uploads/file/gibupiximavilusado.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14498a5b3c---89969358712.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7ajncddk2e4ptnar9tmqvhdhj2/30219436167.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0ebf73fb2---2949817559.pdf
    • http://mariopresto.pl/userfiles/file/ditirekek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb002ac80---94043315601.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+buy+downtown
    • 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://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_off0000d994.bin
ea67609d3728b2849670cae4a97c5d5ca77a2c46579db714d791f3fee3551929
pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10332 bytes
font_01_sfnt_off0000f127.bin
c244d8b474813f13221e6996057b4d40968c17970e2c92822e68b3ccc514cacf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 17432 bytes
font_02_sfnt_off00011eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes