Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5882709b39ff58…

MALICIOUS

PDF

106.3 KB Created: 2021-09-05 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98dc43088c3b93a14a5a9b891d9faa77 SHA-1: 9d9cce26b37c82bf57cf97445357d4276cd812e0 SHA-256: 7b5882709b39ff588ff149ec9d6227eda372645b8597cbc45083948b04618350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5e4ed843424e8854306ab1c11c10945a/luzorosafibixefo.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/wijul.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kujepokisoxixale.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zugixa.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/zefojokap.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6520a474f---96394982931.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/foludamonaxibusaxul.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eb66420de848bf9852329bb629c9ccb4/77731147891.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/suvumonovulogivunotomex.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/lemakepanididuwagaj.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/beeb3bf5e95286b8e3f1124087aad37b/rapufedaxakuvubuwigidemej.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe04d1220a8---68810055174.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b149b57e120489d0fa356b24cd9b870/89883442650.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fd90935a359e32bd2ea3fec32ba45f4c/wukorusomidaxisilovi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/36a8ae08407fae07c2ebd7c0df719522/23805922055.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885166c975---94478086389.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kamanitibap.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088079c817d4---gejizogafotazuxiloxo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rokigexoju.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/mazugonurozefoniwo.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/24840886379.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb339591301---wowofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=factories+act+1948+objective+questions+and+answers+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 18556 bytes
SHA-256: efe39e0652f1620ad46091bed6424dd25389fffcf4b4c2dffffbfa84d5ff1252
font_01_sfnt_off00016710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F27 11716 bytes
SHA-256: dc087294be1d3f30542345850ada3e49aa7cbcf161d1f48ff274ac98e55cd4cd

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