Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c365a693dd2c68…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 11:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 669df3a44b35f66b54b2c51a4eab4a72 SHA-1: 5b9da4748f4ea8aaba11d977e938f8cf89fd5847 SHA-256: c5c365a693dd2c68b5777662d66aef2ae1432e8f019b266a46c1d408ea467d93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anshan56.cn/userfiles/file/1631693835117453842.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0b45078d---papapufomibezi.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/tadesisonev.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/35618524105.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090909025873499.pdfIn PDF document text
    • https://resicolor.com/upload/files/71488263913.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/pubiwavuxulibigitaliwimar.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/timipolutetajoloxudinom.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/xoxufo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9op7j0b18dk0qcgg4qqrnvlni/36443802325.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/womukunonapagovufojew.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3fh2rc1gluvksd9sgptak45oj5/mutenesopo.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/76338435423.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/konuwesumuvulir.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/zadumeturojofobojapabugo.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/pasisepujafajipawejep.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/24461381581.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139e67b27188---lotawobej.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/4029270678.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7f3e0e3722389d3d91c946ce25ca061a/66094195789.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/sojegoxexun.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/pixotolanewamu.pdfIn PDF document text
    • https://theipbuzz.com/images/file/21267177361.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fadatigusokisedofexuwoval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+11+gsiPDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 18660 bytes
SHA-256: 6714ef2c2f23a26b37da10ae29ef213b46e33b78e9c01f0d53eb44ea2841fb9e
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 10016 bytes
SHA-256: db8a87e571615123951e8df8b6141a2276c016acf125104bebf91a304a33e103