Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f7dbf870dae067…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 02:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31ec197ef3ae024099956c51b825f97c SHA-1: 318c4c95cf8d94e2807166be07136c270879ae29 SHA-256: e8f7dbf870dae067ded6b479fa70eb9ae5c917fa839feb42591da87bd04f973d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of malformed streams and a high ML score indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gixiwefakiseliduj.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c3abd7aae586e7d0e01dd63e90407563/94859805163.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/4733a8160ab1a89f38365e624d7c817e/30419814.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9135e768c---komuzepabiwu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/87787685487.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/jofotapun.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/86ce9cb5fe0b004d4fc195862d987cdb/sokizeg.pdfIn PDF document text
    • http://atya.eu/files/file/96556039509.pdfIn PDF document text
    • https://fasleh.net/Files/files/futegepuj.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/34848811754.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/banexinijegadarumizizan.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b506b132deb---66633975286.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zekegaxedomosuru.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26bb511280---tupigutejirenusitida.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160921c8e06bd8---ziwugiwedux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fbe7ace0---86347844380.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/6462964900.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/duvukunevijalekozifibome.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108012100446885.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/xidutijaraw.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/78069599376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+science+class+12+pdf+downloadPDF 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_off0000bf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 11168 bytes
SHA-256: 5f7d05e0cc00e16555bb516d65f8fce249543c73b794101f49b59d155562fbbd
font_02_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 17392 bytes
SHA-256: f03b9d9e92ba8513ce1ce9521ea4e08c99295197b0ad5c788854ff4781abeeae

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