Malicious PDF — malware analysis report

Static analysis result for SHA-256 594a6566047209a2…

MALICIOUS

PDF

116.1 KB Created: 2021-06-09 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f27c1bf958a00bfae8c61c681477ee6a SHA-1: 42e4933051babc6e707101fef842b5e30da16551 SHA-256: 594a6566047209a25f86b27306743a741f6b3dd84731d1580421fc5744817b38
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=nintendo+switch+operations+manual+pdf PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ui16c5rp2ei5ikkjm47edrq7qp/lovaxofotemurili.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h5jo91montmnkn5kvf9esvrv73/dinibeses.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/simewakurovela.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nuberojofebabobegiju.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/56a4721f32cafb2a9080edd647387d1f/84618662425.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/bexujamudisodokumirovazep.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41b3ab8c2---31638748788.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8559c35bb---13861170250.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8ca6de35f96f07f6399cc0e86b95aa9d/88072285134.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800dc032515---minamo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090480b861df---suxota.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/lupaxirifamonesagowem.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/98450106580.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b25037b5f77a6fd25b7862108161dcf1/loxun.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b086fbee85---xoxoketafesivudowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB7 3004 bytes
SHA-256: e3105449b1194f13cbf6ae1ed19b93f1a1c548eb55b28293d69623be62693a8e
font_01_sfnt_off00017581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17581 5456 bytes
SHA-256: 1a768433bc50467ea9cd4dd286232f2b7915532ace67bf7d8fd9732d3e2b5b70
font_02_sfnt_off000187fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FC 11132 bytes
SHA-256: e175c436966d5f0e5700a38c0ed5287c0843168ce95eb0001f91b6e07d03470f
font_03_sfnt_off0001ae0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE0A 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90