Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d8679b907606f6…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 07:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4f17e02ec7e24147390d850d5e335c7 SHA-1: 377eb4cb640ef1c23faa72f37659ca3c7a7e1244 SHA-256: 28d8679b907606f6677c21aeb3ffeda5fc096baf85fe2c8599dea6a19a058a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress installations and disposable domains, suggesting an attempt to redirect users to malicious content. The file's structure and link farm characteristics indicate it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://garderoba.sk/images/_file/vunezujexekumurazowu.pdf In PDF document text
    • http://megalaserasia.com/upload///zopusidetusasirusoxozezib.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608481a8cecbc---ramexenuludezajeniwedit.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a531dfe05a5---toxoredusuwa.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/389dd5cf7d47d69acd1379282e2a8a2e/vokun.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8edeb4c17---91833858690.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3371657ea---misemafuk.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/58aidqdujg87dqkms7aqlcnsg3/buvamolevamivox.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4q0aa362kc41ojveiimt44l65p/67642023376.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dfkfmqipo13eb6o93lclqpnmtb/83638444314.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/zedirukesowoxozapokokevop.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/vijenidigesusasaw.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/96778829677.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e792ca0a---21034025643.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e3bf734add45297399159d36f2802b69/rasenabajesi.pdfIn PDF document text
    • http://teledirk.com/d/files/40214065209.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/deae0a2e3ae0594d63b74d4bbd527f1a/zuwad.pdfIn PDF document text
    • https://auto826.com/uploads/files/4176820543.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mevatabasavoxekiwupa.pdfIn PDF document text
    • https://computerzone.pk/file/vomatam.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/41354295287.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vogodokimiganazukevul.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/57f210d2765fe42301c1753d78ceb1e7/99098038582.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3342eb829f42f6eafadf56690d5055c0/90699713866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=next+to+normal+full+musicalPDF 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_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 17896 bytes
SHA-256: de09fc01a10818acb673558fcc449dcb601ffc68bf6f763054ba3f2a3ec9788e
font_01_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 10676 bytes
SHA-256: 5e228142830ab2ccebcc4400bfd668f246fc0aa877dfe49ce3365eb60a97aa80
font_02_sfnt_off000148ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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