Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2e134ef83347ef…

MALICIOUS

PDF

78.5 KB Created: 2021-07-31 04:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fe920ce1bfa4a97454a763964d2be1e SHA-1: 19077f780c3ba556e743e578342f7f52cf801b19 SHA-256: ca2e134ef83347efb4cff49cdc1122364b5088f46068fde884a320c8a8f7ae3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9a7c638f---45802110952.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42ef02de457660b3ac095fd9a4d18b98/legeka.pdfIn PDF document text
    • http://domplus.su/userfiles/files/52809164873.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/47f71f6d6475b0bfe658ef60c26c25ea/dibos.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f4268824378c85132080dedb437eed1d/56913728569.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/25666519016.pdfIn PDF document text
    • https://tavio.ru/files/file/pizosoge.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/12119c589aa89a700c10b97754eaf7d3/selabedolub.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/43388919883.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/94vvdih7qrr8ck7phglna4pfna/gamegixetizugoxusowakasi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de638b0aa35---gisexederozu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744972bba30---musitubevigosubidezazalut.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d844d0f9dd---fugitanajoranopem.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/55vmbfkdd7pk709fi8b8rp38vj/66644254763.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5e7c5ecc0a16f0a78ef3614382e49429/73204468671.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gavirixajoluxawo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d3af8a9f0ad134085698eafd016c59a/48707879953.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dobifekomufozanumi.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad0e9ee24f89ab5297f719a9da7707bf/26210948752.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/61139827953.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/3966036668.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/52eed9f009dbd8725ff53b64aeeed273/69697021374.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e8219bb1d39547aa061e0a4a80776aa1/81047492096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simple+html+contact+form+codePDF 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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 15904 bytes
SHA-256: 13752dbebe1a4ce2c2fc40f9923a770f3227de6a6e759b185caae214a1cdace4
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10792 bytes
SHA-256: 63ff5a15ffb6d1aee5265232067343ce8b5287633371e2a22094c21a86eaf08e
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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