Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b73dde54cabf5cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 18:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4660f5180c094cdcae897abdc2b37e0a SHA-1: ac1d715f147281749e7e8961184e956e50fa0a15 SHA-256: 4b73dde54cabf5cb86fde27cd6e52ebf4d5b12db0649b9af6f49c9ec78293e79
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or remote-access lure. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, which is a high-risk action in an unsolicited context. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=management+accounting+articles+pdf PDF link annotation
    • http://dentalclinicbangalore.com/uploads/67105155963.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/lumesuwikubadiliwedebapeg.pdfIn PDF document text
    • http://ajambary.com/userfiles/file/72100740225.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac04e01a7d---wesogovakivad.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/32821235703.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134915ae0f6b---17214119946.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/direvawenisumojuzazumu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bee12515680d979999d84f5697f3952e/92097849214.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36733813319.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • http://gibisch.org/files/files/kuvagex.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28217860802.pdfIn PDF document text
    • http://saint-party.com/media/file/18468377216.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wunode.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/50650144780.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/2885292594.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/14332220750.pdfIn PDF document text
    • http://cissi.it/userfiles/files/444107359.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wimetuluxedujoteti.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/fatavobutawu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161420931c4fa8---30834110167.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/co2rgmukoarjs64k60fa7f7f44/50908860060.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kuzejobonaguwalofe.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/gevumomamewusesavik.pdfIn PDF document text
    • 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 11056 bytes
SHA-256: 5627f4ce464ee5fa8f312d1ff7292526aa66b210fb564931758507ccb75ab377
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 16404 bytes
SHA-256: e6f482b16d8d9698cbab46912305b0bbf069c90cca33f8c7e68a3a966b5bb988

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