Malicious PDF — malware analysis report

Static analysis result for SHA-256 697e34d34c11476d…

MALICIOUS

PDF

90.5 KB Created: 2021-09-23 21:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7e28b417681f568808507eda516b577 SHA-1: b5b2bb7ec87b3158de028673adbf9e20b589c462 SHA-256: 697e34d34c11476dbfab3ca8d7fd5351e280143b4b6e805f56c86bdc6b0b5bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests an attempt to distribute malicious content or phish users by directing them to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://jmyhship.com/uploadfile/files/79064862311.pdf In PDF document text
    • https://asset-books.com/userfiles/file/2600140473.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bufopijedesetado.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/rinadalorikilesuzamatos.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/44848433424.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/pavol.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/1769420754.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1086d974654618f3347eb91995785d44/99570980006.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372ebe7a40d---44370716700.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109030210377961.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/36410768717.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sifur.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/73811927975.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210908111517_8756818.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nizofaj.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/217a79cdf73c82aa83bc8bc41cd0aab8/59203863167.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/88386992707.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/3038381803.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/18765501358.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/90338927975.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dowatifowafedesibe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bl1r5tndkuk2jv4cb9cfjt7d3/mesimawilaxosufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+art+of+war+pdf+bookPDF 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_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 18904 bytes
SHA-256: fd7e0a4c8df606d7ef5c0467c3a983a6a16d7f0a8a7f2206f389151ec3b86292
font_01_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10464 bytes
SHA-256: c81c64236bf870839f60e1914d6af919f376359314f51e012cbb61505b58037b
font_02_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1