Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcad39945180617…

MALICIOUS

PDF

92.3 KB Created: 2021-06-30 05:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c3de29f53bede9c57faba3681e7ea179 SHA-1: abb966f645e743cb885ad9a3502a2d528f5ecca9 SHA-256: 8dcad39945180617a8cc73279cbf105472cf615e6e885a81353f6e68dbef00c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac11b226dd24ff9d46c88562ddd21d8/sagijilijetunijepijen.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/557f06726eaf70beb92492fdd217072d/72185586310.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iqvcm6eusheqn10evdi4fsqb8h/27225902763.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/rajuwokimoxotoxulixop.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kudirodokenek.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d68e8f1a66376f48be8685966daaebeb/keruwamejep.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/gakinubisepuwajo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7c1cc3d---22350587682.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sqfeb9fnro06q8341mnhh6mck1/kigatuwagapikofivadogu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/60647989375.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tue955mm2pae0fnggb3bubh12f/63952460690.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98376175167.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406085eaa---22770605978.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516053536.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9c650324942d0fa23ff9065e45b97e84/30288852346.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/69d1797349fc2b02cf401c6a96907604/ganoloxofosagovi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/18867f56cc67d03e3de41e9f8c018097/19601778577.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/kevuwejaponenir.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9ca761da5dfbba7c071ae16302eeadd7/bozekezabosilas.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628100817522.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ba465ebae73cd47953684a33b1d4db90/71982772390.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ae7af80a---feneva.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tibomojapujebud.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821da07ab95---pinimat.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22738ad98e9087bd42995cbcc1b0ad4f/jasipofekepabosedexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=different+feelings+of+a+personPDF 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_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 17524 bytes
SHA-256: af98e0b31492c7bb973f9cdd50e008a32603a7523563bc233e503b43416e77e7
font_01_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0D 10532 bytes
SHA-256: a981f43161cadba9c6b0c61cf1893684c4f9490e2f5971f2ef3aba86f2ae247f