Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d37258d293142e9…

MALICIOUS

PDF

91.0 KB Created: 2021-07-14 02:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96e6ad4e81099371ec436e9e92f83b80 SHA-1: 73dad60e6f7019a09317823fe10263f44fb02d29 SHA-256: 0d37258d293142e9373e7478bb9b28d5e00ad44d7f515bbded44f50e0ccaca61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+insert+picture+in+pdf+document PDF link annotation
    • http://timavoshipsupply.it/userfiles/file/44391494484.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d273e1f6---36648402974.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jamaraliviwapupivikomos.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802757e6db---nusenozug.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/1419237994.pdfIn PDF document text
    • http://ekotronic.eu/files/file/nabafitoxo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mujalajekosowaxozaxoxu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e31f402522492706ca4c60f09cd2d35f/10869220568.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xamed.pdfIn PDF document text
    • http://goref.ru/files/file/fikijo.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/27506084021.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/du34tndcv4v5gksn4g1765hin2/21898551758.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8eabe7fa7b87136588c93644ea0c37c1/javabonajanogip.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/85494318145.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/69489852533.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/5019024571.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17039238230.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/67731232822.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1a1e4641---26766266965.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vodomaxadujofevud.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c8500bef---daguwofif.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5db1972a939dd32f8b81900e08ec79a9/63688546012.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d1ae5b0ad40c22da462ba0e5a4c6255f/70702434937.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/rusefuvapog.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/db1164208bdbdf8cbbf566138e03c1d7/40156890640.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/rupixudibiboxixinib.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_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 16996 bytes
SHA-256: f4223e687f159b4a92e029ac35f8dda90a6df0d5e3ce3b8cb945c52884ccb0aa
font_01_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 10748 bytes
SHA-256: 0bd9ce94103295de7ecdc8d8029cdd3a89ac0e5aa4e2c4b5f7ffda192d0710b2
font_02_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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