Malicious PDF — malware analysis report

Static analysis result for SHA-256 78efd00c360c0db2…

MALICIOUS

PDF

81.8 KB Created: 2021-06-19 06:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6318d1d326f5673a7e452d73b5215951 SHA-1: 8fe4285a1ef6699aaf2e6e1361e174d7f5eb7145 SHA-256: 78efd00c360c0db202c17f4bfeb8f1f1d688dccc2fc8997398e015ecb968faf4
104 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or use disposable domains, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the heuristic firings indicate a pattern of hosting potentially malicious files on compromised web infrastructure, likely intended to trick users into downloading them under the guise of legitimate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6226ef09b2---garugutadobiwuzibanip.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c5593b9fc23b4794e03edb328e3078e1/xexonipunuxixilodamamow.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/78109316283.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dcb60b76324bc78395d8e626254de8c2/kogogabowoxugiguri.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/gipufoguwusigidava.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/61837552022.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a1bd212---xesosewosel.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca431b5125---valelutaxeg.pdfIn PDF document text
    • https://petikdaun.com/contents//files/xafonofekamo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/62148021167.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cad7d5376---suxolurejisijomulifej.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075401846353---jekokewakeletagurepezasa.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/os0pnlnoc7tfs7n1u55u4e5j5l/lukagimatemezuxoraxifo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/81883532393.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/35080798313.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8759da86bc---bofomok.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/66273573579.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608092184d165---96617813819.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/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sumita+arora+class+12+c%252B%252B+book+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://scripts.sil.org/OFLIn 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_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 5884 bytes
SHA-256: a151dda15dcb775721a36203628aa2fe56822e77257eeb8aa2316b7af8f6d19f
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 12040 bytes
SHA-256: f505d8c450a93a2c68d55d73f38a611f4bd9f04fe354b3a3044fd83fcbf5d8d9
font_02_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 16084 bytes
SHA-256: ac8bf562210f9163fcb9214d3b5b8e5576665f260beeea2276f286b91eb3ef2a

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