Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d44dc7b51099301…

MALICIOUS

PDF

82.5 KB Created: 2021-06-13 17:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b73143dbf0d06944edd94e23fc7a1b7 SHA-1: 367154d8955d2ae068393e81c155700725570579 SHA-256: 3d44dc7b51099301c7bbd186fb5a9bae2a43a64d2785d250facbfb8c2b72bdd8
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=happy+birthday+janu+status PDF link annotation
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4c6bc953aa23884749eea9ba37975e90/38328583163.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215146953057.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75ce2ffabb9fc9492bab519a0738a726/fokubosepekugibititalaje.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e16827363---91791446251.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaacde8b22e---puzowonurisone.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/mixorosedegupaguxumeweg.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5118344a6924b1e6b1d82a44f0048c95/loseluregumokegevesaza.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/gozepakikasuditin.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8b0dc9eb4d5d571b18764341352e4089/tojijimena.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8v78dksdliq4gctlpc8cfq42hs/21404917549.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082de9c63538---moponox.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6417b162d415d3e0a7a9b648a653c99e/92778175947.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6bd43d0cf933c95baa9fc00f97475354/potisapi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ade678048ab5426e80241e833ace7f93/resolekaf.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tokeki.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/zuliripiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5292 bytes
SHA-256: 871c4c7f555590ee98fb69934b3df00badb81d817f1bfaa3e447b3ff6666a812
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 9792 bytes
SHA-256: fdb00d2a8717e9f4e31102bae35dec0f5a196f178f178d4430d6b9257929bac6
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16208 bytes
SHA-256: c71220a784e66d1b9765b175977672094e3b80acf2836c9a1035d0b4a3e42976
font_03_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 3728 bytes
SHA-256: 585c3348584848e694a8841402bc5894644d3f868d018b525bc3a4921de0404e

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