Malicious PDF — malware analysis report

Static analysis result for SHA-256 e406d0a9d7bd3e44…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 18:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbc6e90704cfa70042b16018f3586e15 SHA-1: ea6bea215ed5d2e156c984068942a2f6fdb7ddc6 SHA-256: e406d0a9d7bd3e440e30bc78edd40e4d70b45b44c5d12e1d3bfb56541345f3f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=top+20+fairy+tales
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67699b3c3---29595775251.pdf
    • https://bandotrading.com/uploads/file/55481555825.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/74714360417.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d611403f31d---wakesaj.pdf
    • http://absolutelyneon.com/userfiles/file/75531284899.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/90669382331.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s3vu7qkia56piq9c1r77mg2cd3/69658947276.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fffsmb76ifepuf0vgs3snv3r25/84075499317.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089aacb4e658---44822893781.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c64d6a332---98818600615.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607933aa23040---dofefetigadobusemetafiva.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/936a311a14127f1b95738742bb9005a5/bukaj.pdf
    • http://humanitool.ru/userfiles/file/pasobotikuxubat.pdf
    • http://dfh-consulting.com/userfiles/file/mibufelesege.pdf
    • http://hzbmsj.net/images/upload/File/jatedanexuberew.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbfba27a59570225c3d3da43d8a5fd8a/lewakipelujafaror.pdf
    • http://solarissoft.com/img/userfiles/files/25261549398.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/eeba8b033ddc5af709bc6b05076a6631/mapele.pdf
    • http://thankschicken.com/uploads/files/28910728085.pdf
    • http://soflocops.org/clients/83264/File/78934022043.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fb0f906ee12860ee5a46f3e88da83a06/kadaxizuromipogosev.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc31f4806fe---60409556533.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca32fe53c7---59236668277.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4q3dmd5884j81mfbtrn09heun2/18438926286.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87132ddf2---vunesex.pdf
    • 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_off0000ecce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 16792 bytes
font_01_sfnt_off000104e0.bin
671c34c5e7097d0355e8bb37cdaec974389985809a9baf1188bd645252d0c036
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16408 bytes
font_02_sfnt_off00012f38.bin
7cadd22b3021a35ff9654ceb5d2cd0771905d09937c75ac12d1c6c8bdc0dc1f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10568 bytes