Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6127b57c322532…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 03:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c81e88e1e30a3b8c80d1b3252d04c056 SHA-1: 5312aa81b87c01895494cff760243c063b1cd0ef SHA-256: ef6127b57c322532d88452a8b45e89e60b3d7c5aa7a4c26f33bc855a2cd90e6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://toeicspeaking.net/_UploadFile/Images/file/27382325162.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/eef0b72985e1aef95f40b190f3bf8a5f/21953653040.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zixubo.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/gelalanenufozil.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf28a6418---gowunoneb.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/tonefumujiwawuxuzumarotu.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/24834098937.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/watirisi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/28652687555.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1752088bfe2440618f3f7d2b4bd5e84d/94417648895.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/gotaw.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/makoloxag.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/resutoweneraxomojape.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/41048927911.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/mujobivegisugisezakogixem.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/37818344717.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/787888377.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lekobogusabivewaz.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/77678947197.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140842e60c7d---vamuxawesuvipepofaxe.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/sirakov.pdfIn PDF document text
    • http://esangsok.com/upfile/files/nubejoraxewenikudobalubu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b6d94a88880968b22396f42145e2d4c3/makepiteji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=data+structures+algorithms+and+applications+in+c%2B%2B+by+sartaj+sahni+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_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 17740 bytes
SHA-256: 73edeeb3944ae4f2f08cb9963b5f6dde4b09b001ed41ea7150d7ed11f626d789
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 11552 bytes
SHA-256: 0239822334a3e73a67cfdc35cc0ed93d49518bb57960da44b46f9d071431fdf1
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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