Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0b4d93bd4be8c2…

MALICIOUS

PDF

74.8 KB Created: 2021-06-24 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7448494f2673b7e96eef00ebca987b42 SHA-1: 940755e55f67bb17d3fdd50f5e71adcf92af16d1 SHA-256: 2c0b4d93bd4be8c272713394f75e761d2729c8d8c7380f05d4ed69226a0ca2b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815d12d6510---37582853020.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d47406d03f0---8904726547.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/685582890.pdfIn PDF document text
    • https://afayl.com/userfiles/file/nejegokobi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/85li0ivqcfu4pel6i71dmgad80/81480617238.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zajutilipi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r33d49oc709b7u37iaebt8emu6/losed.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b01fa6b2a4e0650286a2ea926bde0d6c/16740469556.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/xupasekarojefubufufonesut.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a2e18a0f25630dbfa144ebb5237cb437/wapogowe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/m7c01258b0urbn8nmsfqj65bk6/5375115976.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/mamamadunileg.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a8474e0e40d736926eca095090809e76/87764313422.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/89906761566.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/25576725866.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a094d9d9f6---49913837402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tron+legacy+movie+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5052 bytes
SHA-256: 22a5a44f4fd287005099340caf96ab971fb8a32f3498e4105f44594f4fa2fa09
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 11024 bytes
SHA-256: 564275c05fefd1a6da44a4dc36e93b9e52c00648cac6f9914ecdea2bbe198b09