Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f045d8d88c5a3b…

MALICIOUS

PDF

74.0 KB Created: 2021-08-07 12:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28bffcf7e1b7fe57e26a9adb02c38be6 SHA-1: 3ba7adc91cf11ae9a5ce3372b21fee2bcdaced29 SHA-256: d7f045d8d88c5a3b391ec85b8cd9a730286cf423c77d56f140737ad9de863dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm hosted on compromised CMS upload storage, with many distinct hosts and embedded URLs. These URLs likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160932b939fe56---luvabusa.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/01acc7e0a4308b420c9d9b3a8553b497/tovovikisokananuj.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/zuvufewefozakalejojuruje.pdfIn PDF document text
    • https://samtee.com/admin/images/file/wosenejaronolo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/89a6610e917db2a29b56c4a3c3bf7148/41797757069.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kufugawugikejudifiv.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/worug.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/xikeditigivafat.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096187230853---75812114438.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a708741527---77335610936.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/nufegujejofifitovi.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/15878653930.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/65324147631.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/bugibupet.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d81795d30---73484662970.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tixedarutaxedukawusulunej.pdfIn PDF document text
    • http://belst.by/upload/file/17756613193.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/86439154143.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/554fa4d121b82a92c6c2414c36083bb7/dozin.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/63610411836.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/af6e10f2fc555c6e1ed9d40c87a5030b/54905959949.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/11862244064.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/61223946756.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vopavejajedunoreg.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/58915770610.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/5647603951.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/39881049240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exercices+num%C3%A9ration+ce2+nombres+jusqu%27%C3%A0+9999PDF 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_off0000bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 11604 bytes
SHA-256: 9443701001b0fd47986e1cb7b2124a948d29eadc0243326cb0ba966dc94cb24b
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 15868 bytes
SHA-256: 411fd823fb9b4e24e544886d6f0f41e002725040ff62a72207538497fbd55da4