Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bb6e2c34b7919a…

MALICIOUS

PDF

96.5 KB Created: 2021-09-02 09:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54d6c5b7d3a50ff1bfa262214cd9d075 SHA-1: 1f070478a1b7b786ef416f9c071de91b1859804d SHA-256: 94bb6e2c34b7919a7716a905f773c9c7c7f620050c102bf9f26f992d9e2acbb8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 6

  • 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.
  • 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://komunalno-vrgorac.hr/files/26454022253.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nmktnt8kms97u429s4agq0mlv5/nulazajuxolepixosogo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/57290036900.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/juxepaxurijalares.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/mupoveziwugoxi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/44557555356.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wagulinewojazunizo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dofevurumule.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/dosar.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8777b241---fulisubipexu.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/7119088406.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac35ac93e---57440031195.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/226198d5f25b6487d12ebc96e62e891f/48444946049.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/3932837065.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e4ca0d01168ec5a96f3ef16829c4d907/pepalerekezudi.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/82006216503.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/fudutoximevanogikenozud.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061919432131.pdfIn PDF document text
    • http://blatt-gruen.ch/files/xuzes.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/19264f696effa8ff215cd34e89e0670a/53361462083.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ab3d20c34f86f21104389167ab0972e3/tewepowawaro.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c669694332484224c1b9a37720391077/wenowimovejinuduriw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c94729e161c---majeven.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/mitutupowog.pdfIn PDF document text
    • http://montesantangelo.it/files/files/1780168190.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/rulobikurudun.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/57646304d16ed0bc513d720504849e94/83110141011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=top+5+supercarsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10224 bytes
SHA-256: 4952e0b482b578270849777186660dde40127cd237965bb0ec3d94ad254cc73f
font_01_sfnt_off00012bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 18548 bytes
SHA-256: a2e5f7bd24e000e60e4844ee1e231903498ac6b679ae3ae82ec45aead56b6ddf
font_02_sfnt_off00015c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1