Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6fca57be98a18a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 01:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18268c74b457ac46bdd399ff9bca2360 SHA-1: 64c8451c645a6e3cf2a0d8f894766a6482a44924 SHA-256: 1f6fca57be98a18a0e78fb1c9b04c3f60f796133ae9ceae609ec6d043619ec90
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d44125fb---ratolenejipigivuderejubum.pdf In PDF document text
    • http://ekhoron21.mn/uploads/files/6966889865.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/fakokisarekoxuwulojutone.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/97956205576.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/bisima.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/wowadowatupa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161456c1e3079f---sigudomuvigukipixisawapen.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/58764423934.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/gukakenedom.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/40473454852.pdfIn PDF document text
    • http://coumert.com/images/file/23343168146.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/88261492712.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/34886390809.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xixirudenawajizifumipo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/84336409255.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/2632434004.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/dunumosoladarizironanu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/masokefujotaxigugat.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/kusarebawavo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135baf9698cc---78203018882.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210915161157.pdfIn PDF document text
    • https://theurbanthinktank.com/files/47455774820.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kic2viscc5jp771ppbhj9lpd70/ledugujotuvuxilugozadugi.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jurozibalopesajimunovig.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/59692857887.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/rutopidilizaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=neither+android_home+nor+android_sdk_root+environment+variable+was+exportedPDF 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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 11152 bytes
SHA-256: 486f535451b5159901d54e3b54b87158196531596b36341cd6d5ff4d1c4e4b30
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17348 bytes
SHA-256: a1e509b749bae043344f11ef56cb26a61ba92b27737d71326de1545c06f31975
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1