Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15634eb32673618…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 05:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06315986c827f4a990c0b6a739e27111 SHA-1: b1926a6e21d3359a754db48c49acf13df5a0346c SHA-256: a15634eb32673618e930a3ed8f9b0208667a042f3098eaa0c79f0cf064629af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of 'bursary application form' in a URL further supports the lure of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738009b74be---68068189577.pdf In PDF document text
    • https://aronabritcan.com/userfiles/file/11861923336.pdfIn PDF document text
    • http://charivne.info/images/file/15964544932.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7f040aa0---nakebijara.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/79736425604.pdfIn PDF document text
    • http://donghotam.com/luutru/files/kuvalolodufobanuxudatoxi.pdfIn PDF document text
    • http://torgoborud.org/images/file/xajid.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076469366936---27413356493.pdfIn PDF document text
    • http://licausi.it/userfiles/files/7038117862.pdfIn PDF document text
    • https://noddy.nu/images/file/dorobazu.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/wuwotujelegusata.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9f7a1a5a67b80950bd4da5ef9f9a8f7b/kilusuwuke.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sefonadasa.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/un9un5mvt9v6t5ma5k9urpj12f/18643377.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161280e5bf2592---17801444684.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8b8c1e3d2ca17a458f4213a39b48be16/tekodixaximep.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c185a299d192be18215657c603ecb2d3/2023199829.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a358f2311---78359605505.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/40167d3725e97914d6a0c7ec61a9404c/keritajulazidefevow.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/45475790174.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129c92b5f425---75514067732.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210621141657.pdfIn PDF document text
    • http://novafish.it/userfiles/files/43389415897.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d380000c98402fe77c170943d554b9e8/28376079088.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c7a8b0044---voxiloxezutopibawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bursary+application+form+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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 17748 bytes
SHA-256: 7e9f257244a8b3ff4dcb6c802bfbb791a217cec1552d90ac787205c3c12e7e88
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 10916 bytes
SHA-256: 9e786e0e2fbf09324c82e17e5fa70fed0666681b2d697422a45d0c113fe3ff51

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