Malicious PDF — malware analysis report

Static analysis result for SHA-256 059f9aa78d1a2a64…

MALICIOUS

PDF

81.6 KB Created: 2021-07-05 14:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02cd97c91b632f6441e33f67b60f1fd9 SHA-1: 424a7c8e6441519204a28e8b5620f15a1adaffcb SHA-256: 059f9aa78d1a2a643bdcd5b79f83644f31c0770da49d0fa043520bad59aa3e70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a campaign to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the heuristics identified the link farm behavior and compromised CMS uploads as key indicators. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/da4ccb8d4bcdd34663ad3c757c37188b/28520043944.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607604d0ad1f4---83335096048.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92118a9fe---nesadegapiso.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/memubila.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/db2bd5c3d323268f82e407850593878e/robasorebusegif.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/48ce5a7cb17f29496723b5eb3d3ae94d/91235747375.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/sawuwudapabujejeduna.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c70f367d---ronuzuperitadepanaj.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/38915182203.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/gisaja.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077673b9b210---bufuzojom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4f677437---ledotumojotujawal.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/s7u2jnj9meiae8hciarlcaurk8/20108020696.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7c0dfd29---wunudepuwokojov.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/14148566539.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vomgsvj0b4vbo7eq199e6ok7hp/89118676906.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fd9b0885b4945a1cd0856bcbdc5662e6/9983218794.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb089f372e---sowefu.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/xokanenida.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090352625e6c---faxob.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/gofowadugokimapawumurez.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab2c4455d2fd8cf831eeb4628090b1e2/6019479463.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/fesorojetozoxasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=one+drop+water+in+mlPDF 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 10496 bytes
SHA-256: ccbcae18f57574bdb3bd32982aea6025c6e7cd31f9748d3916c9eff56ef659cd
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 17768 bytes
SHA-256: 168045e5bb8e9b7b908ac7f356a2d5141aa71f146763cf571ec3798faec3603d
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1