Malicious PDF — malware analysis report

Static analysis result for SHA-256 451d1f3daadd4dcd…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 02:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae5e2bef6195ef1fe995fa8f6de49da6 SHA-1: 5fb71fb83cdbf729f581934710bc5284851a3223 SHA-256: 451d1f3daadd4dcd1641524184e11a03c4bfd16aa3075d7d3410d01a6f6e9e0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e71c75b8f---parisubirojogozixo.pdf
    • https://angkorphotographyguide.com/userfiles/file/97779537137.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/b43885op3rmlg5a3l75jmv556d/kixudigosojixezazog.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c774a27d0---togixetupotodolofufoj.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af18a08d9b---26092988513.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/470c5e6f1c44aa1ab95ddc8fc33edfc9/44516838818.pdf
    • https://daks-96.com/f/uploads/files/69643050457.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210625031743.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06ad4afa56ef54ad04df8dddc0594221/wadutegadidugurewiza.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9476d0abd---86245386984.pdf
    • http://volamtuyetthe.com/userfiles/file/panukidopopuju.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0uipqq91fol6emlk8okcmf9h50/31311645972.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c47a419---13386606753.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/931f494559a9614c6a22f475ce51282e/20276247946.pdf
    • http://blesk-stroy.ru/userfiles/files/falop.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d31878ef1f---1298804765.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c96247942f---15717436306.pdf
    • http://dtcguild.org/clients/80367/File/tadalavadiguniwina.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jo1dhtev6fr1fg74r07jkbrov1/5574113599.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/42130555299.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/92451454120.pdf
    • http://asokmontridental.com/userfiles/file/72118884574.pdf
    • http://www.odnpoznan.pl/fotki/file/file/50264957821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=phase+1+clinical+trial+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_off00010988.bin
cf646f6e7764d23c4209f4e6e84959c03e24b2bbda1e6c21bac866e6b1c9d982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10648 bytes
font_01_sfnt_off000121dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 16792 bytes
font_02_sfnt_off000139ee.bin
7be0cf59172d79f4167d92099a8b8851aded8a8779557069d1cc80e6c82c3fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 16500 bytes

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