Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a49e9472a52f8e…

MALICIOUS

PDF

107.8 KB Created: 2021-06-28 07:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8c75f254778fbbd9a2273b8846bc312 SHA-1: 5e62dea071af81cb0ebe6b7cc66c9a712d0a771c SHA-256: 40a49e9472a52f8ea44b7a23e22a8684f2faa3b45e99e90611d4cc83355d8ed1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution lure, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3d8f85d016d5aa1e5e215b8cb442bc04/jeregopunuzamuroka.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f76cce07c---fulavakixolulobo.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abadece1862e54f320bf5e6574bbe2a0/lubanizimuninutuliluke.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0360fc54e4---70360623360.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe1e2ea75---fexubojepi.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aacdc8bd89d---polusibupedoxoxij.pdf
    • http://kapsalonindex.nl/images/uploads/bemidaxaganejiw.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a4ed1c305---50418464997.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210628_A88D0CB13C104B75.pdf
    • http://kulturazebrak.cz/userfiles/gasum.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uvolaoc1djl60pjdjqdouvff8e/68592692678.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ug53i235cealfvkb4l9epi39ov/6369410485.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b06f60519---42588722823.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f582ae74---rimesabuvokade.pdf
    • https://hashtag.school/userfiles/file/52400081481.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/768f6d80161654ed33f28e50fad4adbb/nisanivapejup.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/js724o7bh3hckjn4n13jk7pmo4/63302577510.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5003108a766b387cbfd06e244e374313/41583243714.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78263cda77---tobozan.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50d9350a892c05d3b34bb0de58b4f8e6/12193653674.pdf
    • http://adabaskimerkezi.com/upload/file/kimasigedur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=c%23+datetime+day+of+week
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bea.bin
9f7c3959bc2beef4defed0b212ca15fd416f19d5a2f020ed3d78153091eb2b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 31508 bytes
font_01_sfnt_off000156e1.bin
3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 928 bytes
font_02_sfnt_off00015dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD4 16792 bytes
font_03_sfnt_off000175e5.bin
fa133159517f2a6d0f2f6931ee77b5db1d69995af6ad61ccf6e639b7a049a06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175E5 16984 bytes
font_04_sfnt_off00018ee0.bin
fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE0 9104 bytes

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