Malicious PDF — malware analysis report

Static analysis result for SHA-256 c388745a2ee7ef0c…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0dfa8bdc70a280ec10ef716403df5e4 SHA-1: ab110e77afb95b414711d4ecb5b2dd63709be5b1 SHA-256: c388745a2ee7ef0c3db28b36899b9dc1e932b1141136e15f77e94b5ad81c11cc
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and a critical ClamAV detection. The file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm on disposable hosting. These links likely serve as lures to phishing sites or further malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mptradingcompany.com/userfiles/file/23757195557.pdf In PDF document text
    • http://paradisoseminatrici.it/userfiles/files/30448177379.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133976ceeee8---96776746509.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/3271371738.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5b519d13f---17770551216.pdfIn PDF document text
    • http://masaze-bohunice.cz/images/texts/file/79367678636.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/52036595901.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/numer.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/61597313006.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/97503041992.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/17111932417.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/26025210882.pdfIn PDF document text
    • https://cathita.vn/upload/files/kadurog.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/17628670325.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/76389872954.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nel3a20lp64kune08d3920ro76/tuzefofabewabulo.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/19863141876.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/52973905879.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/zopifegavinapodorafilud.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/robivi.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/34712282723.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/takero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=streaming+film+a+quite+place+2PDF 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_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 20536 bytes
SHA-256: afa761b14625d29d7abda92cb156a04c4f7c10ef24a6919bbf5dfd868e4a2073
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10976 bytes
SHA-256: ab89acdfc5fdedfffecc29dfd99c85b83d5387fb8564b7dfdb1736db941105cb

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