Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6ca79b4c2c3972…

MALICIOUS

PDF

75.5 KB Created: 2021-07-09 05:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d382d3a4b4162437a32daab9d3f08abd SHA-1: 83edfc21f3f3b425c732cdf3fe01b9901b7d1721 SHA-256: ae6ca79b4c2c39725c980428a0daf53d30128ced11d1405e86bb37eb0dbfa26c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=annual+check+up PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/kigemafetabukobopimizas.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6091626beafc3f7cba2b23e434835f0d/85845198489.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/93711342809.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///fejelepevemejap.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbf98731a---baxudedebodemekokusojo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/zerefisu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/59336129683.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a1a928c1788ddef33356c42ea419a2b2/26973229911.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sapamugibeladis.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b35d33379---ginupeja.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a8e6e466cdd8569f3865bf208668d5aa/gelariv.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160777121c0f35---2066747924.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adea15527c9---zedekikupuzukeg.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jamodi.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/11617437226.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/r48cubeijh6i8ek87v7i1ioep3/kuxejatimogamug.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2ec0318e557b49807ee8a91161b7242c/8796861872.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b22f32cb---gopofoxa.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lobekivan.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/95b07aa82892c2c7b912b4f2bb6e8e06/duvitesepibadetowoxusom.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvn0qb3uelccvb30r0j8lpf0mq/26012159020.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6f629690---6937026382.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/godafupawasenodi.pdfIn PDF document text
    • http://recrute.fr/files/files/63236043589.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/72151462725.pdfIn 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://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_off0000c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 16056 bytes
SHA-256: 1495d5b98b8bfa3f8375e7e3a674bb352a917af02b0029ddac4ebe035405890d
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10068 bytes
SHA-256: 516757b3a3cab2e4748c2097533d3d4ccf6f00ddcce6c06b8881cdb3ec7bf362
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1