Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4f925364eb5ade…

MALICIOUS

PDF

99.5 KB Created: 2021-09-02 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef9b7156f29a85614a74ef6ecffe6bcd SHA-1: efa41b57a8ada9e1d072216f713946bf8fbd5c28 SHA-256: be4f925364eb5adebbdb0b5ea7b30306258e7a2676da145dab341920db9a7b0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a significant number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The presence of JavaScript actions and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be directing users to external, potentially malicious, content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=kyrie+irving+dad PDF link annotation
    • http://rsst77.ru/upload/files/xatigejipejiburisaxural.pdfIn PDF document text
    • http://findplusltd.com/file/31983229367.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1475246be9c9fe0e712b4807384a3578/22223253651.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mlbr6pk1u21tj1vf2gt5k8jsrj/58776689055.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tisovado.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb23ed2d42---tajibipofekak.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a412e032a5e---xuzigagevunuzifefodosuxur.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/79279170058.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/97624472275.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bece73d1ab---8499771108.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/runezaliwikile.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/jodari.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/javefiweveligameliniwu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7edae2ea80dcad1fbaa4260d15e6e431/gurubesaxumefakituveduz.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mobejume.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/60880380387.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e2c03c10---70903507620.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/32744444192.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16117e61b6d287---misiletujegepikedibiku.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210822_D70228D15D2B4E60.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81bf28889a---31919736362.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c031c5414---40124893580.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/taxalufejelajasorizadajo.pdfIn PDF document text
    • https://sitarasign.ir/data/file/64088668536.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/melukadupuw.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/11505007188.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077467383caf---96224488561.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_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 19348 bytes
SHA-256: 3b74ffb1f5241f5e59326b67cbe0d91b80e5605aedeea8e6186b9752b81b4b76
font_01_sfnt_off000150aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C1 10164 bytes
SHA-256: 6920cac91fed2328fa0ec503be54e34c1f431925e5b02254468639e586b5c90b

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