Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa3d2b9ead1f004…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 14:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0acd89a50f48d3926e98763c4b949c80 SHA-1: d7a45a6306c078c144f3ebb88b3f0768af777ce4 SHA-256: 5aa3d2b9ead1f004b2c0f53d0ad2b43c4ba8df8598d70198d9cf2e079537227a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive use of external links points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=types+of+ceramic+materials+pdf PDF link annotation
    • https://tusenfotingen.nu/anvandarbilder/108/files/5225535428.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/ponatep.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7uqkurt39d9m7gmsl2j36c95b3/6752340905.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/6pn8ltfruoou4td2829mlg247g/penonusab.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b632e78a5---95570866439.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074223123deb---jewulikijixurek.pdfIn PDF document text
    • https://o-dance.com/upload/files/mowezimila.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lusuvawelumivum.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/59587359548.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/56556532840.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/lotaraxa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3543e79a---pepujapoloxenus.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/19506621383.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa29fb3fcc---faluzawazi.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/17958531562.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fonuxonutizuxufigotexame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b20fb3d2a---33563860801.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/bojapivajarefedinexegiwab.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vanazesuvi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/likolupinon.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a637bb43604---21609711168.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82867557271.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5hgs36eslhegqgj7ndcn4e9lbf/zefivewe.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/titojomafadejaveki.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1fsdffgs9jflmm1f1h1956pn0l/81590377298.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 10752 bytes
SHA-256: 7a32ccaa62c9748be88242ca05b6d32c2e6fa1557686aaa3cfca879373d629d6
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 17172 bytes
SHA-256: a8e058bc3e21a2e630694c609976fffacf552d2b9d73113d0c6392395a22f585
font_02_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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