Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb7a0cdb51bf14c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 08:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b301ecd1ed5504e682f1ff6d795f828 SHA-1: b0cb6ab1754118544c60aaf6c651114f8f5cdcc1 SHA-256: 2fb7a0cdb51bf14cbe1f9bcc1af52fbab7a2aa887dade67ad3378f53788d24b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/linozinu.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4dd2788d---43168062988.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/86673363088.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/joponep.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/repikar.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/bipigejudixekizew.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/63946478593.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/25117095831.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/25736657547.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-11-13-08-18-67.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/luvopemopoxowow.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/favowolifelilonutizolu.pdfIn PDF document text
    • http://sinostandards.net/upload/files/dejaviduduwejetopu.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/63794318956.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/48743726801.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/67550263367.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/72334558473.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/pitubonabaxufiboramatap.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/82v5b8bktm4k87l5d450ttonj6/67071551315.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150bb5387f39---beruzutuwutumagomowos.pdfIn PDF document text
    • https://norservis.info/files/files/36685864492.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/83029291778.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/lesoriwebupibelaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+angela+apkPDF 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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 10288 bytes
SHA-256: e6538de4f4883add60edfdd25312f4c4347ac94b49307004c529f754a726fe51
font_01_sfnt_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 15408 bytes
SHA-256: 2c3c81706c3770a0a3b85bc2a15777fb130b10843a42388a61c4145d60c13a62