Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5998c52d15c3c49…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 11:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c3c5a5935a22c4163d0c7544cde79b3 SHA-1: 436c7ee431b90e06f21c05a6a5160facc680b24c SHA-256: e5998c52d15c3c49f76979fe9855c27d0b8b243ddb26d596e40f03e7286af384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs. Some of these URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://doanandieuduong295doson.vn/namthuan/images/news/files/82988491965.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1418cf9---petiwovapemanukusasaxogag.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/tuxikoritagezosupibu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2c4c552c---vagemu.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/muzejilejinusagebarebow.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/53082466216.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/66898581493.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67683717810.pdfIn PDF document text
    • https://artenika.pl/fck/file/dadabiwujoj.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/kimukifexekidibonu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5hpnsao0mv3d1l3cp4j1qvkv9i/17889951563.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/61018838297.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dp203gcbctj3h241u65n1d45qk/wiserulasanenidare.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210913/files/20210913135100.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614595134107c---lexagemojukovujonaj.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/25383044159.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/91682862231.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/10377017635.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/74449344965.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jj1f08895i2i9k9btce6kmt3ae/bamizusupidoziwekaf.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109032057014396.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/3705105610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fake+gps+free+pokemon+goPDF 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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10536 bytes
SHA-256: 242d3dc54c82fc6c77032a53fa8032e44437272f5e84531d88b0d982b9d0a6e1
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 17968 bytes
SHA-256: 3ad13e7fa255f9d96eb504a2784aae83e28dfe2da6be988fd6b24bb125c5cba1

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