Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15eef81aa0f584…

MALICIOUS

PDF

79.1 KB Created: 2021-07-22 00:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1f9173ac46393449018613b51a1a981 SHA-1: a5e27d7f591d694fdc7644a1e5e458ace057a350 SHA-256: dd15eef81aa0f5840b7661b0598bfa43852b2a030422f2837eb13a9f5e3f4dc6
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing or payment scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://train-in-japan.com/images/blog//file/98973489828.pdf In PDF document text
    • http://npas.ru/pic/file/jonipufimovazegegilumek.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de20992346b---22343915943.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/62287891745.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/55872910120.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210527092700577.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608695f617edf---dabujixo.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/92597663421.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/tusibewadi.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/vuworosorifelafamivew.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/76043207199.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/84026744891.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39ac415f2e75dabae5ca584a3982e18b/8131178431.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/vinorolarebuvavij.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/paderesoj.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/89965162882.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/26e9cc6503eb513017ff076462c33200/dusamadovomej.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce79101c07a---kawodoponutilo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/mm6odku1mdr1018aa49mdjab9d/bugexekusevijojokifuw.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0277e299adb8ced5840bc10dd1c2a659/xolataguwemidu.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d696ab39ecc---rirodezuduxudagemanud.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/cm9vb1lte2pnjrou5i1oa2n9b6/zugovorixovubosazenu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/aa769d1c0b457b3655ed7a93e56e5baa/84580231479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=to+the+kind+attention+of+abbreviationPDF 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_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 10500 bytes
SHA-256: 41911d39dd5fd0e6ac4b57f5c9c211602a3b8cea4b5612fefa280ac3107261ca
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 19180 bytes
SHA-256: 50b140d270c7e4bebb440c02216dab7efd78114e1056e23968d1a2c16db072fe