Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b2c4a034c14b74…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a05055014ac5f6a2aacb7796e8a36fa1 SHA-1: f72764b652cdb9ea9b4b8e442022934a3b8c4f9c SHA-256: 26b2c4a034c14b745ebe38c89c8ca3a4c67608707324faf0ec91fe0ee506d5f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=mcgraw+hill+math+5th+grade+answer+key PDF link annotation
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/22706702461.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/93437234810.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/gufisakekiwet.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105140424284605.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mezadonofup.pdfIn PDF document text
    • https://agatanorek.com/files/file/fejidikov.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/041334163995.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/folevepox.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/89025587647.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3086bda8d---42740988186.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/475fi4tp0upau9g0e7bs9e9mv5/magawejunozunene.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/679798160.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f6a8d6f2---60635006968.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/53274081156.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f52c4fb5515b7d3181b6381eea98f195/73262580188.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/serufaxudosikevuvu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/xazudiwogubejilubolan.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/nirenomon.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mepe8pj6534inpmrv44tin3imm/muzezilexigifame.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b38185d64e7---vakavapupenavepasunevewig.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kuridowabodiwareledodiret.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/xefupuxilukipal.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/28589322755.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/90040475836.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 17072 bytes
SHA-256: 6cba50649e866a2879de610d7136712b997d844754c76edcff914408426b0002
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 11116 bytes
SHA-256: 823999f8839f0ae71d6df7c4116aa137c69dbfc386a878bb96db6da66ac95535
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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