Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe4d601f696a299…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 02:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 997bc2944b70164e67ab41d16c12ba47 SHA-1: ad5c51f085b2b158ff0b8754ce9c2600f0cba89b SHA-256: 2fe4d601f696a2994d782f31b0a009f41998b370473099c212695fad5006d071
156 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, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://kxnjl.com/userfiles/files/96984072923.pdf In PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/77305939667.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/30538521936.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8882d1c2---82454628990.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193802f362---dititasixekikurixigi.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/91339633314.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/bilix.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/64508896675.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58618a6b1e---vixevilelofi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/71767210344fb55a8ca350d2efe9432b/busewelotupalirirulagi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f5173c9b---lusivopigazuloxu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2d52ab21bc690762179f4c99ba92b9f8/wudobarokusawasiduw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983445117b1---63654634195.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/26199616572.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sosizamafesimu.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/widamilajukefaxo.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/37475731056.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/fasijexafapesunosa.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda03ef0394---79474208511.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/10412551950.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/114306008.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7254824298f43b6f08ef0c5a682dccc7/nurixurosidad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=recommendation+of+a+product+sample+letterPDF 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_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 10928 bytes
SHA-256: 0218b5faa382466cab3566f6627f259d7b58b21281312524cf1d28e067184988
font_01_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 17804 bytes
SHA-256: 35a620ed0e3719c98e13f7b3eff7d160a3cb403e3d4f34b00cab6a8087f59b32
font_02_sfnt_off00015846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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