Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4a4f5e033e142…

MALICIOUS

PDF

97.0 KB Created: 2021-07-24 14:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4c1c014f9bbda29974d607991fb72005 SHA-1: 273b1b5debdd766c8f4251d8f3eb9bdb9087faf1 SHA-256: 5fd4a4f5e033e142a8f4a55dc0b2b3db7a24a56cf1523af18c31f845ed993045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://ansonseatery.com/uploads/files/73780171640.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077699b7e2c2---jumufonagomipukatex.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/84441712685.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e7t2cuomgks7otjpsp3gfgp9g2/38218053723.pdfIn PDF document text
    • https://immobilgold.com/file/jirugixomazini.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/60506180182.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/94894725025.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096f014746fd---jomofejisuxinusilogix.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/mimez.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wesev.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dlijd0c1dnjlgb1vp261fa60e9/jemilifejinanuf.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/97516700947.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735be3be0eb---81776804685.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bbvidnk9i7k25ktk827hp7o7ga/34520663461.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/tewagogava.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6b49b1b5---juxol.pdfIn PDF document text
    • http://esistore.de/userfiles/file/11474089960.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/kigibemeraxub.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/19114794291.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb14bab92---jowaweniv.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa6d8d1---fifovapiworoxafelotujobul.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92eceb19c6---73484653222.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/47189120173.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216301748155292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=domino%27s+delivery+driverPDF 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_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 10364 bytes
SHA-256: 30476aa99f14e50f5593df739ea0324aff86c3c661deac94316bbb2f5e8e06a3
font_01_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 16832 bytes
SHA-256: fd7a028e82db1af3b72d2bc47013282fd37ac616e6487a129a10d439469e9d36
font_02_sfnt_off00015dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1