Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c1d3a716ab2734…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 22:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00c44e00dddc30080aa8e0348442d638 SHA-1: 6ccc3579460af97df8052f2f9345c13a7420312f SHA-256: 08c1d3a716ab27342ed0b86390bf8022f5d34d62ae83a24e97dd05647a02e034
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87587443ac---57253291757.pdf In PDF document text
    • https://sofahatinh.com/upload/files/fezezatita.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/70595688722.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/7104514278.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348c51280a---jozirakugojegomewilaw.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/46771674708.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/45957136653.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/xozutiluwaloduxom.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7a9a3086---35619630678.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bilabala.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a4ab762ad369aaa552596f0f20eff8b5/japolavenexikuleriw.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/kekirufiwotitudifuliz.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wulumebagedikadox.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/3364137036.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4281a1b0---rofajamonijilulolis.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/viminowanigewovofozawes.pdfIn PDF document text
    • http://unsersohn.com/images/file/13879674377.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210804003506.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/18006293169.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/sogerowiwokefanefiwusepa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uou60shi5j9ro4efh68sfucvrn/17762855232.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/redomiradefefobumanitefet.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a471e156bb8---fezosatilokukefotuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=garageband+tutorial+deutsch+pdfPDF 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_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 11180 bytes
SHA-256: ce17b7c352eccada15b1c8376bbd5d3d8fd71fdd1630409f551d1b14b5cec8a6
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 17876 bytes
SHA-256: f80540349bee664cec9dfd8e215b4b13fa83ac8894d651ce12d55be6f212b014
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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