Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d41d389b4cab4f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-22 03:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8acd64f8d2a8c63fe1a5ad2f997b955 SHA-1: f34360c4d677e377f3523ae0a0b198df75957166 SHA-256: 89d41d389b4cab4f4d1d7bb13a48d42ce6b337497458dad6b01b37b0eff7524d
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://alphasigmaoverseas.com/userfiles/file/xavurumakutol.pdf In PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/50605731952.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627382540.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1f3e2dd4fc2006b13f2f896d42933b46/kixefikepub.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5e29fa5---65461167882.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/vusilodejorivibomisovar.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f045675e7ae---65849748411.pdfIn PDF document text
    • https://sitarasign.ir/data/file/86110599325.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/44504870241.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bfp5q9abjmq227n0ttcjbre9j1/tiget.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2f92ce9ebb9f419260cec7575d30b0a6/jidil.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41f505fd1---mowidewixosivuj.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pudewaxorewafok.pdfIn PDF document text
    • http://nnt52.ru/userfiles/file/diludotasepezojef.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/xevusawojazokigarokuvime.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/72851584627.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/20890560180.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/gejizejulanorujet.pdfIn PDF document text
    • https://badoza.net/userfiles/file/68415642868.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cc147cdad1a03ee5f6f5f32c70e8b064/tadebiwapulezab.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/mijusexekesa.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/dopuritugutedujuf.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93a6c9404851f5448feb33b5f9f16dd4/11207090192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=horus+heresy+book+two+massacre+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 11168 bytes
SHA-256: e91de896631cdd5d1fdb31f1e6b04d4b29888b1ea987ea39552daeb3d40bea83
font_01_sfnt_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db
font_03_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 16736 bytes
SHA-256: 09bc930f7f7acdbf5372a6261e5f16c84c6a89e062eca629c0822cc8ec48af53

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