Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de926bd28f0573a…

MALICIOUS

PDF

121.1 KB Created: 2021-06-27 07:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7763aed104d67d8c6135fa2b282f4121 SHA-1: 6c395a0dc11fc33aff913332c251d580a4cea898 SHA-256: 0de926bd28f0573a709e3d310f95a34205db370485aa53e49f5c548818ce68de
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lecapsuledigian.it/file/98471415136.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/84fa02fae8b91eb14c5c9e932e1c567b/zutizobizimuvuvikevo.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc49e1688f7---76504557500.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb509d5bbb7---xonupibavosises.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d3f2b228---xagojalibadu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b2f73866---33187703658.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/6804743374.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/98111029176.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5cfde6e47---zabiruxujusajisuvu.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/numisegiredajejakepi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7kvfsh7ok70jkbvak42mhb8c54/dafofetomeza.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c741d310fb1---rumebex.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/63e130a3f039ae9f47cd0373ebdc452f/84441389359.pdfIn PDF document text
    • http://djapm.com/userfiles/file/rujiwogifanawid.pdfIn PDF document text
    • http://asustainable.com/global/file/nexalej.pdfIn PDF document text
    • https://tomas-music.com/contents//files/gukupivetevogunu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/25705453152.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/cb1bf8556ed6acd824827423b6b6fdee/rawesokuwujetozenoguditap.pdfIn PDF document text
    • https://menu2uplus.com/images/file/38324977580.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/41894568203.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/37792112706.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073105f02103---tefebojolamovilopuzizare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=learn+calligraphy+step+by+stepPDF 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_off00017730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17730 17948 bytes
SHA-256: bd4fc1f9977352756f587f2b1b1c9db2281202ca906f0c3a6efbf8812a0f2d7e
font_01_sfnt_off0001a68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A68E 10744 bytes
SHA-256: d8cb07f023982500cc353e6e431019b2de2bcc0812df68a25d00a93417f0b9be
font_02_sfnt_off0001bef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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