Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e355bfcab5c57df…

MALICIOUS

PDF

92.8 KB Created: 2021-09-22 16:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 212079fca5e2e6a5b714f60e8a11c139 SHA-1: 3a5cf3bed14ba1762afd62b1684f2f34650f2e7b SHA-256: 9e355bfcab5c57df572b91bd30ca7379716e1e2594c0ea6fe70886e257149319
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://communeouchamps.fr/userfiles/file/39815658357.pdf In PDF document text
    • https://erdemlerkoleji.com/resimler/files/71453873017.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/zinusukakawimanobi.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/96649094093.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/xibixivibigukafat.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/98957097035.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/31d90aafc163fc97f160fa427b7dcbb8/kovopepokiwafomopule.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/sokaluniwagu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/46112555191.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/vabibegarowiri.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613034648e720---vezozemovaviforir.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/51638124588.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/79072664275.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/48198973266.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23d52d619---likunijoneborotafupovi.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/fonamivedi.pdfIn PDF document text
    • https://perbloland.com/userfiles/file/80470172039.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/metowibefifofijo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/95302717963.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/44677623367.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/rerejejunixatuti.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/65543836791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=8+ball+pool+unlimited+guideline+ios+2020PDF link annotation
    • 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_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 11228 bytes
SHA-256: 0abf7a63772946b8c9631e7b3915fbc0bc47e698a7adccef95f67f1da0f9ff66
font_02_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 20108 bytes
SHA-256: 332336e52964578cc4dc2064310e10e53ee454febabe3eca37dd684c67ba850b

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