Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cbd2459b31ac6a…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 742c6a1e42f659efa5b11ca2ea1b140b SHA-1: c03b7df7afd0ed97017ca3f1d5623f1ab89b99b5 SHA-256: d5cbd2459b31ac6a0fed0df1052ffe9f9da4a693eb689e03cfc69c7b3831b7ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a link farm pointing to multiple external URLs. The presence of JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting to phishing sites. The link farm, hosted on compromised CMS uploads and disposable domains, further indicates a malicious intent to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=germination+pollen+pdf PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/14234384040.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16108fbcbbda08---731249625.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/58519573971.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/tiriwewezejenelovep.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/xegidigalixodebujogavo.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/39391205922.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/08c4ca544aca39c90cab3b8e9d6e3f99/mazosozujamem.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/pupujojusataminepon.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/dimagipoxib.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/93603412420.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/12153698024.pdfIn PDF document text
    • http://atek-ent.com/upload/file/92385630762.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/ximitibu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafac3facb---99210393595.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97364bda8---78608147775.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/silowutosesoj.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/gumifenefojageto.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/temigapokotudexijez.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddd5c22c4c---59234290973.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99ae82540---44959241208.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_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 19224 bytes
SHA-256: e24f090f9ae46cd7f2cda3cafc442a225096bc8f13294b1f856b46fcf8efd905
font_02_sfnt_off0001500d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500D 10528 bytes
SHA-256: 92eb8cf0e08a2772c1d0ff3bde8679b072c6ee1d7dc504e6062d412ca07e964c