Malicious PDF — malware analysis report

Static analysis result for SHA-256 821396d9adf30056…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 03:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1562a2f27c700732e7bc9738218b02f SHA-1: 021b92077894181bbea6d0c258bd501059cabbe6 SHA-256: 821396d9adf30056ea4e5530573d9a83c75bfe0207f47927463194c6378b817b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828287c60a8---kisejiwajawexajigolagu.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/llkl2elkblkjinn41vo5vfvhl4/37024411731.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b8996ffa8febf2af07720b19219b3e41/jufujuzaguko.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108210415127458.pdfIn PDF document text
    • https://datawire.gr/files/files/tobokare.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49dd44cac---fedozirigegixina.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0aed4360b2fe2c1a01db31e5dd717cc0/6846046162.pdfIn PDF document text
    • http://korytnica.net/data/files/tagedawulazilajuj.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/juvulogowozutabew.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3b11a21b---duxomatufob.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/48860332832.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/domesewujip.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b6666740951---danipajuvize.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/bisulugifomowujisanuri.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/melibuxubulolaja.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/37003492197.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/juwidirebor.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/jigivozewojuwofosuf.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1dc305e0740285820a514a0a2f34ba9d/84922540679.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fc6b008d---judumifupikadojudizom.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0472412f09146e0f4c239e84f8c05f9e/51205808246.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/1690476070.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/034a5de48fdbf0380e96b45a104a6d7e/nateruxelixisozixaf.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/23872148809.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/22rot3luve0irrjnna75o62v2d/4901225744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=java+programming+language+for+dummies+pdfPDF 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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 18048 bytes
SHA-256: aa69e45b9a5ffad5890fb20813e1eaa8bbc8d61fa4ff52b6615007e89cddf703
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10900 bytes
SHA-256: e67bb22ae0f9a68e24ec67d8dd576e4286b47b11c1e57c823f3e435c36e0ca9b
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1