Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e494fd8dd8ba9a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfc4b7b89f45ce1ed03ab544a9f7b211 SHA-1: e734c3323dd7e7ee7a66509fc7578225608c9188 SHA-256: d2e494fd8dd8ba9a3fc4c0a0c0d3696fafd06fa960a52f353b366b26d6b7d880
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to exploit vulnerabilities or lead users to phishing pages, aligning with T1566.001 (Spearphishing Attachment) and T1203 (Exploitation for Client Execution).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://manu-transport.com/documents/file/1094775952.pdf In PDF document text
    • https://thibiditrading.com/public/userupload/files/dijudi.pdfIn PDF document text
    • http://lyshiying.com/d/files/madakowirukukex.pdfIn PDF document text
    • https://dukumanis.com/contents/files/25841077571.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631004935.pdfIn PDF document text
    • http://yuli-china.ru/d/files/14364316653.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/72073760355.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba94ee335---86413694467.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/noxazuromuwuxena.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210910202220_gdvya2.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e392871a42---57053029485.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da09ed539c---59344116011.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/malanomidanif.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nepijakipugoxexin.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxamakinisun.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/29633420233.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xuvipinizof.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vuxozaxidal.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/86874768119.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/29413869877.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/63803028949.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vevuvikofuvalavojikifosif.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/rezegelab.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/81813047608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+after+we+collided+free+onlinePDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 14912 bytes
SHA-256: 3f81958d50ceb3d0e78f6b3749d16436fd75266f9873d96cdb0c80782a560b75
font_01_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10484 bytes
SHA-256: a6c90119b9200baf822be1fa0aa1ccdf8406759c4228b255862449e294fffe44
font_02_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1