Malicious PDF — malware analysis report

Static analysis result for SHA-256 36db7e41fd4331e1…

MALICIOUS

PDF

85.4 KB Created: 2021-07-09 02:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46475535d49a04c80c4b38e407ab5f76 SHA-1: 6c6f61ae71ef82111fb3e1ad103cc916f267a97f SHA-256: 36db7e41fd4331e1beaa4c4cfa26ae6dd4788462dab780bdff15c4d7f14c8ec8
204 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 heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. Notably, the document employs a social-engineering lure to trick users into installing a browser extension or update, a common tactic for malware delivery or credential harvesting. No scripts were extracted from this sample, but the embedded URLs and the lure suggest it is designed to lead the user to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=mts+to+mp4+converter+for+windows+10
    • http://sotel-perm.ru/site/file/30551489251.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084220ed08fe---vififenazedipitu.pdf
    • http://goldenteriyaki.com/uploads/files/76940957611.pdf
    • http://cw-cut.com/uploads/file/xitenajakavote.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0719f4dd---goparuxuwiduroxinigu.pdf
    • https://kuzeyilac.com/resimler/files/fivejurogopom.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160773abee0bad---87197614771.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c6fdba23---25130439550.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/ziporomilobuxuras.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81847a61ed---kufodojebugowo.pdf
    • https://aterhesseg.com/up_image/file/1893241047.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/91b40c34dbbca49741270b435d705c68/fipukodifebikuvedotiv.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/56cdf6f5a3053451ff845d101816a42f/61955750225.pdf
    • http://canigrup.com/userfiles/file/mubab.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d61bed8de---77706604551.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3787655158.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69f11058a---numonamivoxoru.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/66f8916dbae093808621b9007350aa8f/84336943006.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c797d7f955---34274984237.pdf
    • https://menu2uplus.com/images/file/riluz.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/1451757432.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516173736184207.pdf
    • 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_off0000e9a6.bin
c3c7ca56512acce08e682305e3441d4d45f4c8d295729aabfae61a7a6f635bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 17216 bytes
font_01_sfnt_off000116d5.bin
7e1149d799f23f7177b8c3d797a2911a639dc258b649561e017c35891afc92e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10972 bytes
font_02_sfnt_off0001306b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 16792 bytes

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