Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ef593a632c4ec8…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 19:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1385a29e8e4bf362ca5990c48c921905 SHA-1: be465ae26a21f09a0de9f5a93e9431333d6089c3 SHA-256: 05ef593a632c4ec83a1cdcb42d4b8f75532e99b2f5e26365e5f5ea39b47ef0fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fotuzi.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc340619357---baxejikiluzubagisekira.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7607d9fb7---jasitemiwi.pdf
    • https://cardion.dk/gfx/fckimages/file/74117428691.pdf
    • http://slhs1958.com/clients/18590/File/kidalabunexaveteserebub.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d1c359a---tejesimexivalisowos.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f31ea0ef---77222517916.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vrgkjelos4mqintkfb70njr5j2/10833178144.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/zupanos.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716700dce89---kilojuwisu.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e53c6416---xabaz.pdf
    • http://holidayinntorino.com/userfiles/files/38157420538.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/275e5bdf21ccd608d9d143ffa9f0d0d5/92506027731.pdf
    • http://garderoba.sk/images/_file/39214333873.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87f6971ac6ee71fe98bdfd556916646a/46585174745.pdf
    • http://ahlhy.com/uploads/file/031846183224.pdf
    • http://instandee.com/Images_upload/files/34611346198.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8ff21917---71032712229.pdf
    • http://soles2walk.cz/data/file/xonupaluwodow.pdf
    • http://soft-pro.hr/upload/datoteke/82736870402.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/837d52d7102b7958dd6b972fc61048b3/zuxunuzutuki.pdf
    • https://vieclamday.com/userfiles/file/semugigebijuliluw.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/19760605295.pdf
    • https://ka-base.no/images_students/files/mixobewakuxobogogiwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=icse+ml+aggarwal+class+9+solutions
    • 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_off0000e984.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
font_01_sfnt_off00010196.bin
020f1648e2772ca6d83a400b119440fccd11cec2eb54df5f7f9b63fb2d0bc838
pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16760 bytes
font_02_sfnt_off00012cfc.bin
8f211be322e1b04f98e194a7e0ce28f317df178ab6cb46ea9fd91214b0cbb4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 10880 bytes