Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8adad43d8ae7e6f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba1d959b1b6225eb3c8dfbabd39013dc SHA-1: c92876572a9659dfc7c0665f5be1bd7ef81e256c SHA-256: e8adad43d8ae7e6f3a6470a669e03b1cdb5773c831a3d9894fa053e46b65ae71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to external PDF files hosted on compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute further malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://uralinteh.com/uploads/files/69298998335.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/caa8e51e48de831773d7c49c5ab5d963/pigugapowozidudamodawimo.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/valadubunusoguremod.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/11903295426.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd7dd3129---14221677347.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090521424897.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8ad6bad19c2a13250bb9f7960b26fb16/jozozikoxopuninoku.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a6d764a5cd2b5f619b8bbeaf0d29bd9d/13824781019.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/76972108276.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/ziwowa.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/lolidirimimasanak.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/rulumojada.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/25197143129.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/19363617188.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/vopiku.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/baribulifija.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a3221826---kopuvubeverikaporimix.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/lavetakumusip.pdfIn PDF document text
    • http://baove24h.org/upload/files/mifunisevowipifigibuvabuz.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/68675474492.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/65795392139.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/pozoboguranemipuw.pdfIn PDF document text
    • https://manenshop.com/upload/files/33124578460.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/mosos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+live+streamPDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10088 bytes
SHA-256: e8008d0ddc1e67ea8dd043c49a144d8892873a74ebfe03aca4e2da26f5a13796
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 17636 bytes
SHA-256: a66df9abc3ae0eb72b3bc6e036dd014192b40a2e73dca85bf8850eb324ba06d2

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