Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbf59b9b8aca5cf…

MALICIOUS

PDF

80.4 KB Created: 2021-07-18 08:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd6d50706e60ce82f85f82fa255c5358 SHA-1: e018b27c00dc6965174fda74528934c7d3446717 SHA-256: 5cbf59b9b8aca5cf3994388a46bb21801218681478262a2c5488d10369b83101
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress sites, suggesting an attempt to leverage these platforms for distribution or SEO manipulation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://yingzhaoliuart.com/upload/file/joxonafowunemikifem.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/24106380954.pdf
    • https://dusunceokulu.net/resimler/files/melenuzewedamupilure.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b629b632dd6a9c9e7527cee9eda72451/70469278999.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a593174c91a---rapudejokevaxasasi.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a1e4c27e6da39b92a163165b7d4d0a14/fesiduxedalilixu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92425e280e---xoporiva.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af84b66f20---gijeruf.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed0be29cb---16621381882.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9d33ccd6---venelowajoku.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec76cc54c1---bomixorixuwiduwepepof.pdf
    • http://ipublicity.cz/data/file/28173636367.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247d8a672a---56796474850.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/97884321486.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aa8d98ed4---xefirur.pdf
    • http://medica-brno.com/files/94465276511.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/jugevijijejixixuz.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84c7478ac22f60b0f0b034f579a1de93/68829168219.pdf
    • http://airconbank.com/upload/fckeditor/file/joduvomiwunonogikip.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8vcb3v3ridlssm73n0aictaf86/92120055136.pdf
    • https://thefencedocumentary.com/adminfiles/file/finex.pdf
    • http://nagymester.com/userfiles/file/ralimaliremo.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1d4e0b82bd2ceee6cbf269d59b7740a8/pevaxojo.pdf
    • http://chicohigh1987.com/clients/47015/File/vifobirifakuvopuler.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aster+alice+haslam
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
font_01_sfnt_off0000ecb1.bin
9619866a256e88b2be69507d4edbfe49c245613801ea145e359c85657041f5c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 10252 bytes
font_02_sfnt_off000103bc.bin
54b9b5bbd1237a23b60d8952bf97539f32a53d78b117738896b060fbd30e0c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 18920 bytes