Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb5232125059c17…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 01:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4b2c36a2fca51b137c15138f2af7e02 SHA-1: 6dd067f68b62866793cd06a9d24798f14280ad9e SHA-256: feb5232125059c175e52b13f8116c5b53ee7618a7c39541be76b4702f9ec0b2e
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate that the document is part of a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://smidgel.ru/uplcv?utm_term=yashica+mat+repair+manual PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4b38ed0a228871d2eddd4ace44388636/85298127220.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f30d504f---gekolepudibemunavawanid.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/84684851585.pdfIn PDF document text
    • https://laser123.com/geektic/files/rawagupiwaneximuxazalode.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///742276312.pdfIn PDF document text
    • https://andhimazhai.com/images/files/36147916.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d0d7bf26---zodaxuget.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ed25adad---19367921037.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/61207410988.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/066efd9440015c9af32d95215f7be01a/56295674089.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/rosuvelesurixakenudu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157df00846---lujusamolimupetorafuna.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160706b1170f9f---14409338285.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43329889790.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/vetajipupofoloxod.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb183c1ea1acafda04721eaac1102944/bisilujujakeguzevam.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42e03d50ea---dolizesuropazijepiwe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126cc7dbc0c4---ralef.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/doxigemibigoliworili.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/tugubudigefutorugale.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xisowoporusopen.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vufoxulusugamemapike.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a310d---zokozipisegiwupepa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3tp06alq01d577g1kj2vfhkufs/potunoxofexovaw.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jozavekesi.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210801024333.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/1036640623.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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10604 bytes
SHA-256: 196ef28dd1242bf335a357b31f02e2decd8d1193682fd6f5d5b06a13a7cb71f2
font_02_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 17572 bytes
SHA-256: 7a26015a8319f215fdcfac46bf15f4279f690aa83cb4911b0208d0f059205da0

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