Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cbcf31650e1c73…

MALICIOUS

PDF

95.5 KB Created: 2021-10-06 18:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74e4b603e288b407961d0f91df26424d SHA-1: ef2bb57a04418a76ca0b9da8e534cf49a3a37e44 SHA-256: 72cbcf31650e1c73f7e1d1ffb91ef93eb753e4e2fc7d6ed995fd0a536c9dbdc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as a phishing trojan, strongly suggests malicious intent. The primary goal appears to be redirecting users through a chain of links, likely leading to phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=american+horror+story+trivia+questions+and+answers PDF link annotation
    • https://a-metal.e-giant.net/archive/file/files/vekad.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/nopikezugodiwavegitok.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/99852092267.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kerusejafinebemexiliwu.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/14320750012.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nevijijok.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/ginokupakuxonuxosovatil.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/27817326283.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614152d8ef4b7---49947274680.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/43788040423.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/65610724523.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/96151024712.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/61f6f491ddab5b94e5f9cbfd163f1e6b/58071413582.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161517a31cad48---8646568690.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/lujiwoxomotodanifubularit.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/mekegokiwedim.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/18836740701.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090424034312.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/pasazazedopavobugu.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/17269725063.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/27964876941.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pisoxowarabapuzafujititif.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/q5i6fi865hhdndlbf5qilpvgl8/vesonegirifusixonanepexuj.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/95764997148.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_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 19548 bytes
SHA-256: 36628699b93c857e8303a27f344da5041932a4567e4b8c0913fd2740593d0849
font_01_sfnt_off00013df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001560f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560F 11084 bytes
SHA-256: 350b69dc0a880e3d9301124d50ee6ef65be2f036c53e550130ead97df1f27840

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