Malicious PDF — malware analysis report

Static analysis result for SHA-256 403d79444075f26d…

MALICIOUS

PDF

133.4 KB Created: 2021-06-19 10:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 413bd5de12f92e722c772197a4c98cc5 SHA-1: 5572e2e0e35a62f15cd145561f10cf2ef034f996 SHA-256: 403d79444075f26d9f246a1259d644680462a8c6dd6e89d7f60b4517a97a13d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'exercise for articles for class 8', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=exercise+for+articles+for+class+8 PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9f4cd3b8291c986907c5b191cbbcb222/sujegikozubojirutasis.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08391c970---90650369346.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f039bf23---83060714654.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9grcn6634f16cm2mgttkmp3ed4/30642204118.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/73238785155.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef8d89cf1---82194232500.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fbdc455fa03be1c95bf020c236f0e37a/72963641825.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe5404f56---34323455586.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504114754642.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1ib1e2ceqm9d6es8lkl9n2nvni/kalunew.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6c565db890f9c8b1873138914326d8fe/sojatixiwev.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/xokerogigakuzatukum.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kuxadowivemo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9dcb9e60---zupojelosilifepesig.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/zozege.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/3aa494c46c934020d8c872aa815e7587/giwusugunabizekofegi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xasune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ad80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD80 4776 bytes
SHA-256: b0149e854364b054f3584199f55ad37a0a0e03830b362b02509df874d2f53514
font_01_sfnt_off0001bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC6 11004 bytes
SHA-256: a1ace8fa2a1600026bc20baffb46f65025886ff0ca5dc16b23fcc1dc55094b81
font_02_sfnt_off0001e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E34D 16548 bytes
SHA-256: 18b15f837f9324a3d46a3a992ddddc01c4b5731b73a53013aa367092a3a7ee70
font_03_sfnt_off0001f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9CF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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