Malicious PDF — malware analysis report

Static analysis result for SHA-256 5528270116fdfa97…

MALICIOUS

PDF

93.6 KB Created: 2021-09-03 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08e9acc45b6ff5788035456df8da9fa0 SHA-1: ce8121533352d5292ec59b53654ca3f364dc42dd SHA-256: 5528270116fdfa9752b67c3b4f2f34f55e6d06fbf926eb31aff8c8fd43ff778b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by both ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm intended to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://bauarch.bg/files/nomufefusegilavomegipifuz.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a77ae1f---11832738625.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/dae50f9fc99ac9d87fd28332cf52431f/55149035614.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/os75pblf9jcrbacl2tobnm7tur/35391286746.pdfIn PDF document text
    • http://abwrva.com/uploads/files/pebogufomureku.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xoxopikovimemiwunik.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4de9ca1c84ba3ece4e8993ec2964d023/bujugelapabararipobof.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/84359942563.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b46075c929254ce82321a41d3cfcd657/76854711559.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/14505767163.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ce0b3289---dulapen.pdfIn PDF document text
    • https://famecosmica.it/file/98647363659.pdfIn PDF document text
    • http://air-ned.com/uploads/files/71157464978.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/97088654878.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c104f623e69---66710390133.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/79187779993.pdfIn PDF document text
    • https://domilot.com/uploader/files/bupabedakenideluluza.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f337aab42b---vowerupumupemelorawe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84ac1dd87e---waxujesudako.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gepupulokuxerugonefumafiz.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c283d3e62819e724ae54def47b4ad91a/tumawaraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=capacitores+ceramicos+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_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 17180 bytes
SHA-256: ec1a0cbf14d1316eeced44af040de930d953c3d713544da384eb67e0166f750d
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 10660 bytes
SHA-256: 71164c525d816e3c3b78525e1b1e88b0aaac377afe998ec1259729d60ab52f3a
font_02_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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