Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ef8a86dd97230e…

MALICIOUS

PDF

101.2 KB Created: 2021-07-30 11:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ccaf17edad46845e7da92be7ff87997 SHA-1: fd475c698b64644dc23a5ef9b68c09c8a78a354b SHA-256: 59ef8a86dd97230e224d6891e6e12e1a339908932513ae4fe05acdc122eaf0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting reinforces the assessment of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alternativecarrepair.com/userfiles/file/61100629068.pdf In PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/atljhvch9ug1nfv9t1ad8shgaj/zizatutufazebo.pdfIn PDF document text
    • https://norservis.com/files/files/duxitawatimoniragiduki.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/55728095825.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/lezazabumiwazag.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ssjm0cndcl6vt29snr43rvb2s6/96634293861.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a6a3c02a---41048925513.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/aks6o7njsi7foh5a963nfvbu12/sunenu.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/tigadofesuzobebuxob.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d72141020e83014fce9e1dd76ed9212e/89190205774.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/34452180639.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/87139180581.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ae880a230cde6a5c0e90bfe84ec1e4dd/zufuzuvi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c585297e11f---97917353237.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/sagifukuvivonafi.pdfIn PDF document text
    • http://beliangka.com/contents//files/mijifafifalegedofadew.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/zolofevajuxe.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/kokilimirijukipapibu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/tiriwolaxuxavogifuzunivo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zabaxubotof.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d718477ddccfed23687c64713cbb9c05/sibopifewetozego.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g41pfrehimfdp74p11fpqnbsk7/93926895899.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8bb2e51b---82598803763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=coreldraw+user+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 17624 bytes
SHA-256: 1a39b364000dee170c9ad3119692cef819be27a54978f12a80b99232cd823b9f
font_01_sfnt_off00013eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EB 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00016c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C68 10440 bytes
SHA-256: ce33135ed47a5a6e8bf246b3455fa6ea5869f31c595643a0857b45d05a1c227d

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