Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cea84261782689d…

MALICIOUS

PDF

442.2 KB Created: 2021-07-31 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5e03987d2d466b250d7d5bd2055f473 SHA-1: 37e08d5d9440547045b15eb91e7ace19f6bedb12 SHA-256: 5cea84261782689d68eecd89f21ccdff5c0d6eebd17dfbfabd5aca761755336d
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

Heuristics 5

  • 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.
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6be3518f2---19251052377.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5fc84dc9661167f6aa5e30cee828d430/19438041121.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/jafadekepokigelubela.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/kirisegudemik.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/be9a30cf794e38c11b54c9b49ca66421/16931303188.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d2af340d---12855039284.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/62342747370.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/52749570880.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a8de4f91418dbb4015944f5554e78882/folinigose.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c49f2d2b0---46222808090.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/41287503013.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3cc4d1b22---derojivaxezixikatugedipuf.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc4115faf---96243658452.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/getipofubemada.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/25971958467.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546e99f801---65194243907.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921c098d064---dabetatejizotekukamakalo.pdfIn PDF document text
    • https://doganagolosa.it/file/donuzatavozigusato.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/6571022135.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/2039793562.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021358188947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solucionario+fisica+2+bachillerato+santillanaPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/78738380736.pdfIn PDF document text
    • 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_off000673b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673B6 10868 bytes
SHA-256: 65390ea2ef3c213f486edbf8f2d03318c9e243299948be60350370e40618ca1a
font_01_sfnt_off00068cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC5 19440 bytes
SHA-256: 87c2cf51cbca8414a12ec604e4d576a2767e0f725b1798de57a0e7096d7874e7
font_02_sfnt_off0006bec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1