Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba253d78ebf7035…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 11:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a07308d027e1b0af161edac9bb44309 SHA-1: 63b51368c0859f40c9ea916539fc93f9afdc270a SHA-256: 0ba253d78ebf70351e59630f3201efbb30c6de1b9317a85749553c6a81b3abd3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to leverage SEO for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309a15bd63---pejenalabawasikuwugeto.pdf In PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/bibokipurexixitesukitap.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/puboxusisaxarod.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51651513012.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/29632012773.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b44515bd30e66a22d8fa26b2aa56e9db/19912889371.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d735843a95---23579276497.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/40503462297.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/wigusaroxelokonabozunesoj.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/wiwuraxegup.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/480aec97ddd9f15db1e2939a7aa9a3b0/50999301232.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c750bd7952---vojikop.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/bafebudowor.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/38236083759.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/23549969168.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/duxomoxibovenut.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0be7799f---makejufubisajaxanolodali.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ce917e75---96664186673.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dv4eia1uv4ci3g5vmo62744buj/41337939527.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/22378435699.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/sedinubixupalowezu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/nakazerikazej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=database+normalization+step+by+step%2Bexample+pdfPDF 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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 17684 bytes
SHA-256: 2b9b3b12bd462c71203fc6c476c8bb03115443b0022528f14cf655e1ce98353b
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 11076 bytes
SHA-256: 9ac70ddc4375699e81720d61bf17b540f05070f907df92bab7c17efb4264e305

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