Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de9e27435c018c7…

MALICIOUS

PDF

81.5 KB Created: 2021-06-27 05:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be5cf0e8e9f6fdc73aafffa4651c93f5 SHA-1: 3d8920ecca15780bca90c2d12eaeb75764597962 SHA-256: 3de9e27435c018c76fc5d0568cf13b522b64e7ccc2ecedf3b71e3a3fb8db17a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to WordPress sites utilizing the 'formcraft' plugin for file uploads, suggesting a link farm designed to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the nature of the links indicate an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fce6deb6---6312788256.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33080e19d---94075024511.pdf
    • http://marthomaiticherukole.com/userfiles/file/dusoguxeniwalesekudosok.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fe288cc3---furalepamofifepofawavigu.pdf
    • http://ufnk.fr/app/webroot/files/file/38651745335.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c9ef77046---27482920345.pdf
    • http://daindnc.com/fckeditor/userfiles/file/dufaburubadebujalam.pdf
    • http://ahchala.com/img/file/bisaxufefatoja.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ab1a14df---93946380307.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/339bf3494e3ac44c5ddaa589a6aaf0ad/befuxinapomuda.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ade28eb12---vilevomilopuwelamotepoba.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085335949662---dojozojije.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/12726329323.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/93814458411.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/94248b4250ce1f3f57d76babebe53a2a/4510299370.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecf4ca84b---kutabofiwobiraxiwagumodu.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0f4d11bfe0c22533b0d5f7f55e21867a/9095126488.pdf
    • http://garantc.ru/userfiles/file/56861048399.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/71263dd2f9070bfd6e59b1f8e12005ea/rodidanodowotis.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/u9fjfb3ji0dea8gl5d5mt2i4h8/47111981613.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hai9sv4j2p33djre5q3u49d1a7/56411195615.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e8774e7e68ca9e75fed010e7d8ff284c/70006872204.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+world+and+the+west+toynbee+pdf
    • 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_off0000db71.bin
b27ef95ec54b9f44fd88e387e79c6e1c498f85ae63e30a754c640c83c299987e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 10808 bytes
font_01_sfnt_off0000f431.bin
5a427db2c4e4fd639686b0de524c38990883f4e22bc7d025aa6fa146713e21b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 17232 bytes
font_02_sfnt_off00011f58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16792 bytes