Malicious PDF — malware analysis report

Static analysis result for SHA-256 85402961cedb3335…

MALICIOUS

PDF

88.1 KB Created: 2021-08-17 00:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3d9372e819acede875358302d63ff30 SHA-1: 762cdc8af109616d48ac4a1c01fcfe9d7e84d6af SHA-256: 85402961cedb33358ea01dca848f4af3e9b5c93ee3aee356cc2ff497ed11f772
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.004 Mark-of-the-Web Bypass

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a heuristic indicating it instructs the user to disable security software, a common tactic to bypass defenses. Multiple URLs point to compromised WordPress sites hosting PDF files, suggesting a link farm or distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072208a72001---9015033348.pdf In PDF document text
    • https://uleshuzatabc.hu/files/file/41995939787.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c48426abd---96371986382.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/93040158735.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v6b8nkaeoct7ppthq807c1jsjj/fulakireferizufulex.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/towobiwojujojab.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8ba898504---wedopedugepe.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gofuwunafa.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/motajamuxowiwu.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/7028056548.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xikonexuseriposasovol.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2fed22878105cd6bc546ba95c9f228f5/60433648226.pdfIn PDF document text
    • http://vodnik48.ru/content/file/wulanoxa.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/88219307715.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/2373656406.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/71280345626.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/197554e87cf3828874cef089f7967d60/70694646473.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160733bfbd2f37---toxubibitadikoj.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/20100981948.pdfIn PDF document text
    • http://micruts.org/userfiles/file/fotasujikewozofumipuzov.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14db14f1c---detesozalopi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/95c48d2feca7abb1cd1a2ca597dca250/57677670435.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7aa443077---nofanume.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/voxetuxirufumaxabex.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799a4679d18---bodiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+aimbot+on+mobile+season+11PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10620 bytes
SHA-256: dd7258efde7f1ceba66f392c9a40ae8067e9a28e10aef774b664615396279e59
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 16152 bytes
SHA-256: 72dd55403894d4b4622306d8e53457d72b134b3bf00c4f2ea670cc2f6870813f
font_03_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 17176 bytes
SHA-256: 3d044e2efe622875030b177086291472b7e70ae53c3ddd4c13dfdc8b8b6f0a1e