Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7bf05ec3dad789…

MALICIOUS

PDF

122.0 KB Created: 2021-06-13 20:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54e8a11deb8466f27b8fd5f222445ab7 SHA-1: 9d9c91b6fff71c41208fe5008a4036ea6c33b6cd SHA-256: 4e7bf05ec3dad78928e694001bd7cb80c0ea35392b5fafbfa03ab839b0696ccc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites hosting further PDF files. The links are disguised with search terms like 'Attack on titan season 1 episode 16 english dubbed' to appear legitimate. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=attack+on+titan+season+1+episode+16+english+dubbed PDF link annotation
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/aedf410fa03c817c12e0874b115da3b4/57896631962.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tudufolepul.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/1fea7bc9a940e2320cb75785a2aca335/pojorunatigiwixev.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29cfeb975---13869983947.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/af206738676497d07422f16da78e2f32/mavep.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/24132182473.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075798f408c1---miwimemasibimim.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/15286207624.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/brqe8cqgv2v7emm9g7k4tdd6k4/xuzojalituxozutilafu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/91de7bc72639630094cc3e675eb377e7/16254651748.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4597126f---kapukexuvekosarij.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1f02785e---24822673045.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0739b7970---tolagujipidilekokiki.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/segixuzutanapuzedireduxu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7971232f4081f74d83bbd7a7c70d7f25/54974766557.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac6198e48---nitopu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fc571cad306fddddc77c60e84b813bf/mebunevuriranusename.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3784270eb8dcc13656b014824d0955d8/kototef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BD 30900 bytes
SHA-256: 62239da356b59f54ab1e2737a3b90344e1068b0a57e9d7dd3859ff4ee5d13b68
font_01_sfnt_off000194ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194AE 5640 bytes
SHA-256: 345a9f5402d8ed521599b0bbc9415b9b9413a3fd1cf9b5642ee0063b55ec24a5
font_02_sfnt_off0001a7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E0 2044 bytes
SHA-256: 9812099c5b295b859b411b79c63ef0f3e15cad7fffbe3efb0a8bc6b6c1165317
font_03_sfnt_off0001b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14D 11612 bytes
SHA-256: 8c794c98f825d0197a8fe991500ee706dc4f47f69749fb2dbdcaff9f50718421

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