Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01e5785229f203f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eb48f9996c05c94785e515e7abf6685 SHA-1: 30ae5bbe52999cf7dd689e8405e498637b5a0809 SHA-256: f01e5785229f203fa55217d5e7357584b17797195772c40a08656640c886f24b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ktmcollege.org/public_html/userfiles/file/pexetura.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8db2d21---pewapuz.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/64340830568.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jevopepoxovalekadazuput.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/17123437915.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/1728802131.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/dumelel.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/vulivujuxixuxesupujunujin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/retodepotomipoguvomexe.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_ACCABE28A4B0E4BA.pdfIn PDF document text
    • http://zaiger.ru/img/file/sarujejulem.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xaxulezumepi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/zatorotaviwubixinigizibik.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///98898821063.pdfIn PDF document text
    • http://vucert.vn/uploads/files/20734716740.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/wosabexufo.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wovisudisekemekosowadik.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/21499599994.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130174a2b509---tojapukimup.pdfIn PDF document text
    • https://koratspring.com/upload/file/62877865622.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/romevifudakubipe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6e8d53a5---15636031510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=iphone+11+pro+price+in+bangladesh+2020+officialPDF 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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 11184 bytes
SHA-256: c3e10be451458cf7fa16ab120d891fea4e3cacf5ef793e1c9d4f22bd6644c96d
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 19360 bytes
SHA-256: 318a12a1c4571dee5dc71efd8cb6e3f8662c65306f205a6b19b4e0c161ec446f