Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6cf8c0fb826d7c…

MALICIOUS

PDF

78.1 KB Created: 2021-07-26 15:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ceafcd14b16fc6c6a6079becfa39ea3b SHA-1: 9d5e7ece978294bb4bae30a2adffd9077dc3f333 SHA-256: ca6cf8c0fb826d7cc9c4c0d605e98b5aac4b59bc7f2324e375f5e780e6db9342
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lku6j5fjakqj90mdffojtlvh7o/lijorujokilesinebe.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3dcbfbf4---povozof.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e4bcbcc9887a161a6839890360218753/29034981009.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b01dbb92ddd---gurezal.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kogaroji.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/65507349007.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/rezegovavazupajukoxude.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e92b2ea9f3749baf6cde5d22c11e4c77/82777455963.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/berarobenumejodavojo.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/fajewodevasetolaxovuxi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jofepifavovozadifalewevuf.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/putonaxejoju.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/79791633651.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f593c1bb8d---95743156723.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/66199022173.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/33850689695.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2b396020b---xerizibafewete.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/kiwaxaxiwugokubasuzafa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xazurikatapu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/kajalodutope.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/1rvitlmk8gldqlvqbm9k9lagtp/najusosasexere.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/javopazodetibalesafaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+take+apart+a+kenmore+front+load+dryerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 16432 bytes
SHA-256: 0df6e50477963754bfa63f40bf39e02bc01babadc06760394442b20d6172ffe1
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10680 bytes
SHA-256: 7cfbf294c2c97d195f5f41b26ad052477ef97696424c77c5b80d641baf127eef
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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