Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaac8bea4c1b0ba6…

MALICIOUS

PDF

88.9 KB Created: 2021-06-24 07:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6c193ddaa2a7141cb69a4a6e073f29b9 SHA-1: 157bc3cc3d82609be8ebb5383b23b3894ee33a53 SHA-256: eaac8bea4c1b0ba6c0ffcb4b6ea906e60e8cfa26c2c6ee14f291d5ffcdd466cc
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm pointing to compromised WordPress sites. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like downloading payloads. The numerous external links, many hosted on potentially compromised or disposable domains, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a4a52a570491ca7b2fd5b6a027e3f538/3131692391.pdf In PDF document text
    • https://2acontractor.it/images/file/wizejofirob.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/86ff1b0ce47432c4c90fb5a3168eecd9/vegigojozojobexo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dcd3c48db---vinebewiwasixumotijejiz.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/gukozerojamerokatorote.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e5ab067869274b307ec97d2fd5da9c4c/xurixitulanip.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/xejogikijuxolelaj.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfba9ea10---26652635171.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/27265586808.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/khiptr7kssufmmnbq36pcckl52/94574284317.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/vasuwesojitosafetamav.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/79133977871.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/37491094625.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/kogojoxixeluvate.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/muvevejonewuvovapusojoxur.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/v9t0dm571608f0o17d4a7f4sgo/70252577781.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1925c7b302388ee3d2a90b006f23d299/keburotubomofabujipig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=c3421+transistor+datasheet+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://scripts.sil.org/OFLIn 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_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5440 bytes
SHA-256: c59c47c1e9c68cd932f11e5fbd4de85676034a2d51cee1fbb0017a29107eb479
font_01_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 12160 bytes
SHA-256: 135bb5e1b7c37f5253ae4366e71a973daa6571c3a262b00653daeb246773c464
font_02_sfnt_off00013f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F41 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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