Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5223ee4870c8fa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 14:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 894d4ffd27866ee56bff6d3d736f3e29 SHA-1: 3c93b72b6b9cfb684a9aed3d3492af60894f6b1a SHA-256: da5223ee4870c8fa4a47d0a925dbda4e9f27f16373855cbc7951d17de876b735
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and links to compromised CMS uploads and disposable hosting. The embedded URLs suggest redirection to potentially malicious sites, likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://philabc.ru/uplcv?utm_term=special+launcher+for+android PDF link annotation
    • http://architettotamborra.eu/userfiles/files/63268541310.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/66412060376.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/49656691630.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/setigabu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cf062c8a---51456064110.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jakimusulukijelumo.pdfIn PDF document text
    • https://windsbs.biz/files/file/wedarakidewufirebodojole.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/jelijoxupameresex.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/10470662356.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf1fe011e---28669983186.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210912225321969594418.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/64059599172.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/rojutufaded.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474f5350f04---kapeva.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/52710188743.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4996055645.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/37551905164.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61698380975.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea546561a---suleguparevuragowo.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/zutujumesitaxox.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6c4dbc16---majalofebisexuximixeru.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/99702483000.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/regumimifuvob.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/73067403853.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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 19156 bytes
SHA-256: 59ad7bcae8ed5f64dc9b6937690c8a99eb28fddddc5f1249ad84afa824afe8b4
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10628 bytes
SHA-256: bbc30be3ba15ac96dc39ae04e0594cddbdcbe1ca367ea3b970507f6f0c9e9aa2

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