Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc8a11d6c51fbe3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 08:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e7d9fd14b98c2cd3ea3067a0777f8d7 SHA-1: 7de269571b492459a4e9037948ec114358f4593e SHA-256: dfc8a11d6c51fbe3e4bf7e68bfe8b78ebbe6a614ca241da018248109b4f62812
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and a link farm heuristic strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9sjkidbsb9nkm9sm1c0428a8pu/44515645277.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9df1d7942f70d73dcc45b9c1329364e/nizudokaviguzikovavazirop.pdfIn PDF document text
    • http://zzquansu.cn/d/files/81291870404.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/legagimugejenuj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/84c4b1cb52a1829c17e8ab4263d31ccf/jozoxepozekibuxerafokel.pdfIn PDF document text
    • http://besteva.com/upload/files/sazanotenuk.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb12d8d0d---wapupadopesu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/24707371934.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/88a6ad0b259d4c1cd41aec1231006ae0/pitusivuwerakogotugipi.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/sitoxukifadilitanap.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gobuwibatadujazirujigivu.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/67053628786.pdfIn PDF document text
    • http://df-foundry.net/d/files/regasegafawuj.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/51984562511.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/leberizisoloveziti.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609262cce5361---19019732641.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/293a77f6b6d9d4ca0d2beb34c913cba7/6405747853.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e23acaca6f01f05cd105ed25fc6af303/48568619183.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/46740531047.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/87b785c6502c345526cdf331ebb17bd9/gazikodomepovejadulojulu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/11861923336.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a742b75972---kominevibododomurige.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5d470cd5---joxadunuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=solvents+and+solvent+effects+in+organic+chemistry+pdf+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2479a2fb15708a164b3d50d1ff37bae1/98986996500.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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 11408 bytes
SHA-256: 3ce2209381a8a44e59d8ca111717ec4e51a55365f6b41563c2d36f626f84bb0b
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 15444 bytes
SHA-256: 3f12c4b3c8044c2f3e9165f808566c4343acbe455304939487feb26050882b18
font_02_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.