Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23eaeb4e058488…

MALICIOUS

PDF

70.9 KB Created: 2021-05-13 01:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd83acd9be3b029280311b604745c36e SHA-1: ad02478061570365cf2d84ee5fc189b5a721ee4c SHA-256: bc23eaeb4e058488f5a364392db1c7d44acc0340a5b4bed8eb4eb3bad058ea2d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08945a9d2---jaruki.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bao64ku47tapvj6bo2u3d2l5dn/70039899626.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7b870fac203f1bc9ea340a51a2547ef5/83652624292.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9dbdaba2---mirukare.pdf
    • http://aaaexpressheating.com/userfiles/file/57526971032.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5f33f156bd2c0a858de7bd8a5c808569/14880718096.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bf9663f4badd6ec5e73bc8c67832b578/pepilewakasukaluwujeluzur.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba16f3cc2---mewowubatiri.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083459e4c4de---69049707139.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rd0k3heu838q8ktt09nq345dab/wovuralupesa.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0q8gjmc0erjadj3s14sqfuuk15/kevutukogosi.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/cnhfbvkcpr18hpmlv7ldad9f3e/43306391255.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f6c0c3e7---tixuwubilukabasefi.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095467714c09---bujidurovetiragodamizawum.pdf
    • https://arvikabc.com/images/uploadedimages/file/zesekumakonigaje.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9210bd881be7664f2c9a0fa3843f83fe/66571004383.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=weather+report+of+kolkata+eden+garden+today
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d570.bin
6d4a7746cd4e5a8def6900aea415869e2f53fe4b2bf3157625d3d5f114a20edf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 5304 bytes
font_01_sfnt_off0000e78c.bin
a5dd4799a349af3d4b7b120347021182e6e9f48b1b88447bbc0f2f39efbf32b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 10988 bytes