Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e923d7d3c79960…

MALICIOUS

PDF

97.6 KB Created: 2021-06-26 16:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae6199b4da40365bd9bddce45d28cca8 SHA-1: c01c5ece7d3716fd2eb5dfd57538189600aad0d1 SHA-256: 58e923d7d3c799604d814b88d51b96144184de66aa4483ccc86ccc107e240df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to lure victims. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this phishing and potential malware distribution vector. No scripts were extracted, but the structure suggests it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf39e0752---43494214846.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bueaaq9dl8oduoggicc65mlusi/jerobazafafilotin.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609497b06b7c1---dadipetufinodabidut.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e96f18c3---56120691639.pdf
    • https://diedacorporation.net/freesiafiles/file/vidogexibixujogugiv.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/51578107726.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9c3e0b35---noninazeviranutij.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d747cc48db897dad96b6c246b2b811b9/vefepaxilegax.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/db441fe30106091e78a5698f33cd5210/mabeni.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kqhrl4ec6r9mmnbao773sgaskd/85879358275.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f37c1cc---fidutogufaxifewi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ead64627---45385472925.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/vamavuzarekam.pdf
    • http://progfin.pl/userfiles/file/dafapejatuvanovigerezaw.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d24brb0uiql4floov94gp9lfj3/60943758161.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a6b15d7fb0e7122e571b6850c3a78d1b/tepor.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb23f342b---bezotilakazefunojexofi.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c22186674a58ba6aa2826f20b3e34e69/gosoluzejusose.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f0d04f3a40e301c65825bfb5b3eb08f/26672274163.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/38852baed029542a3c4e633464fae650/1314142451.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003ba0ec33---49755972557.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972db35496b---86664747028.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/67dedae09a0365d90aa478cd0de6fb4e/kifupafemadezin.pdf
    • https://benqmusicworkshop.com/fupload/file/80225970298.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7c5ac101---diwogamamozutaju.pdf
    • http://maslatalaia.com/userfiles/file/27395606077.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=reply+of+thanks+to+boss
    • 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_off00011c10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 16792 bytes
font_01_sfnt_off00013427.bin
61787825031552a44b8d2f911510fdfccf40774bf202e623ba5f8cd78a68a628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 10656 bytes
font_02_sfnt_off00014c60.bin
6f73bd4442bd2c6a78870c8159d16061b12d2b8ed104420f4f6738dba0b76792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 17532 bytes

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