Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b86b0121484dd3a…

MALICIOUS

PDF

94.9 KB Created: 2021-09-12 01:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3d9e2f5770d134187099070aaf0e4eb SHA-1: ace061127a98ae4ed6887d95cf219dca84544ee5 SHA-256: 4b86b0121484dd3adb4cbdee8e7e19d700dc0b0c102d3f189698ab4c17856279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, designed to redirect users to malicious sites. The PDF structure and embedded URLs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://coretry.ru/uplcv?utm_term=wonder+full+movie+free PDF link annotation
    • http://kapelski.pl/userfiles/file/2763110082.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/bodejesemejexexe.pdfIn PDF document text
    • https://capecoralliving.com/media/file/13643241340.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • http://grimastone.ru/files/gonulo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/21852764954.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/nolov.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9672684b---fokotojuzifidobe.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/gifazudima.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/rilafaparejaxepudadiz.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/volis.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/saxoloduju.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/56175108497.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/35028585209.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/80018548989.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/19653886718.pdfIn PDF document text
    • http://deauville.ru/files/file/zidusovitebukusidexefugew.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d236b566b5---zonojolunile.pdfIn PDF document text
    • https://777mto.com/contents/files/80405564997.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jerepotominogeje.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906194635_wmr9ya.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/78238223401.pdfIn PDF document text
    • http://sql110.com/pic/fevejurudalajopamaluvabi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 17352 bytes
SHA-256: 9697d111cfd39e5fdba4a10a59a10f7d4f6044c4599fc2c3f238cad2bf99b3fe
font_01_sfnt_off00013f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001572a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572A 10248 bytes
SHA-256: 69407bcd91cdb9fde721975a1e07ee4aa37eebcc73d7c50ce57bcfcc235b0c66