Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ba5d5854c587c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 22:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9eb497f52bca0399e9b1c423cce03232 SHA-1: d114f5470ecc148d50e00b406e1d1f812ff06695 SHA-256: 454ba5d5854c587c6d403e57eb78033d5bf251ce6704419f1bf73587fcf3788b
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a phishing lure, specifically instructing the user to install or connect with a remote-support tool. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the ML classifier's high confidence score reinforce the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medvor.ru/uplcv?utm_term=4.5+divided+by+7
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mqt84uj7hktei3b1uvurhsfdaa/jekorezikilowa.pdf
    • https://glycocalyx.nl/userfiles/image/file/51650361990.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87a13be14---vijinene.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a4083f4b184b9bcbba15c7a002e3f3f4/rologanujeg.pdf
    • http://leakefamilyreunion.com/clients/63964/File/27754301962.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34c13132f---43508409021.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/irml5qhsf3us3batse7o9ov4o4/girax.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/fa6a525cfdf592fe4a829cf4a4280be9/nifebabuziwujos.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/40239130020.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe75cfef6---bitakowebesogeladoj.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607038bae8cfd---57659576430.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/73067894248.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9prficnhi5695e9kiiecc26t2/kutudonejurono.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/807c9458bb90bdd896c96236f1bb5b75/xekukuxuzuse.pdf
    • https://ludifrance.fr/userfiles/file/disagogepibusadu.pdf
    • http://digifast.cz/userfiles/54765690152.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a327a6ba7f0---8404761919.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c223d841355---77226242149.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j9nlp8odht8c127q1be9t2aju4/24110244924.pdf
    • http://auxerretv.com/content/public/file/30299968582.pdf
    • http://chokmanee.com/userfiles/file/92944049101.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ad2963e8a84a6b3b4e4db0f0aad1101/rikikutanedidaz.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9u34lu5sisum9au873srluq9l/3153967472.pdf
    • http://albertopizzetti.it/userfiles/files/tupiroxekikunu.pdf
    • http://lumieretvie.com/userfiles/file/2216150709.pdf
    • http://aryajob.com/user_upload/file/vafotofubowi.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_off0000f2c7.bin
91614152d25917e0da5f70b0e04e3b6a2f347852ae456c96378eff0c6265f1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 9996 bytes
font_01_sfnt_off00010918.bin
aed45cc50f5ffe5b96cfe5f3b2268e7e6c601b9d84fc86c3c292a2902f7622ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 17076 bytes
font_02_sfnt_off000135ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16792 bytes