Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04d8b99c98c6c02…

MALICIOUS

PDF

82.2 KB Created: 2021-08-15 05:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaad32000bc89ae67efe90f83fa479b2 SHA-1: 151c378c1907e23b2cbce112f75487d2208df2d8 SHA-256: a04d8b99c98c6c02701f7261ca7b95a57a467a9f55121ffd789639e1468aed3b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with a link farm attack pattern designed to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=nani%27s+gang+leader+telugu+movie+songs+free+download+naa PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d23414795---bagakadaxoguzokabenebes.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6fcbd30b---xukujugawekazuza.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/vivorudizime.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/sedimaxesipi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/35d7a47968c56ee5b8130653cbdf9dc1/82838024977.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdeb8ebcd---91892357563.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/wibibasivokovesagenowu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/poqkqnnq0au4povmmjsf8mpif0/limokegozobasoba.pdfIn PDF document text
    • https://anakmeong.com/contents//files/foguludimukedalavabenipi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3ebc7cab24f0c2088a1b432565ca04e4/jijubiziluvajipafij.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/kadakuvode.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/87011dbcdd54f7152c422f821d420be2/60580126411.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lksaef9psinjge83l9c1lm5g0d/90353117932.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648fc6ed8f---vokaxasu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/posadabu.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/kexugajoxepezixabuzugutas.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc6fea439---pafafenidemixulasozazu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9aa34d7c---mesanozupobebezunamit.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/duvibupofeg.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d1ot4mhud7i3pbj0tr48tll2j7/bugotarunazujozokubesaxak.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16118584588639---filamajenojunen.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/midubuf.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/rikofirezeligason.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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 10960 bytes
SHA-256: c4b0e17c2a0bdf63d1c0f4ba4265846f41336ea4705bac24cb1ed688d4340ff2
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16556 bytes
SHA-256: 79f4ecba0ef23a81b192044397e4f45afb333137fc4fc219703df8f27dc0f77d
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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