Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef475d9a5b9f8ea4…

MALICIOUS

PDF

77.8 KB Created: 2021-08-22 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: afd1926d9d16a8f712a2e4f01d8a27ef SHA-1: ad25c9699ba878179886d47fee709482aa19c7ee SHA-256: ef475d9a5b9f8ea48a5be99fefa60fc6f71c048f54caa2eba68c9300e0abeca3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pistant.ru/uplcv?utm_term=ejercicios+de+agudas+llanas+esdrujulas+y+sobreesdrujulas+5+primaria PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4k6kugt9jrd10pl1oiui7taa5b/14493262191.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/depinepavixupupefunu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/pelomofewafozalos.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/12135523661.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rd5lcff5154q0tof0h3rd611b1/65991780192.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kidavaporaxatiw.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/gepejowolekowujoledufigi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8a7gacvp4l4j45fga2g3rni3n2/82430352486.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/e6voj95hrggv5qq2apv5ltt2f6/16740165203.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ded1192a73fa8f28d3d08ee67efb1f2/lowiligumad.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e98540a4---papewadagoputedesa.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vofekupofov.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4c98099c97f59fcc11f9703c93ee7c7e/38889677164.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61737530670.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nibujatosarefowadugu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/20991965786.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rujizonejepakitigo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000fffd2a22---pubuk.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/40105588506.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a354ccbcaaf---zeluludipola.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/39i1u7c1939vpk1lci381ort27/jeralowasumuxinufedi.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/68414218801.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sidazuberadaza.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/77868893981.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3ad09d397837fa6bb99d1b01199b8333/13092679288.pdfIn PDF document text
    • https://luisamariaaIn 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://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_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 17384 bytes
SHA-256: c8ffa680d6880c0496e79717b0276655bfd2ff967b95de6f9c17fab574fe4eda
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 11360 bytes
SHA-256: 8168bbf00334e313d60d86712b0036b2be407df5fb052bca148d9b9761479a77
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.