Malicious PDF — malware analysis report

Static analysis result for SHA-256 9520a1f91d29c0f6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41749715bbb5fa790aef9909cba31a7c SHA-1: 4e6ddc70f9481343186d98e00c7d0d1b99a20de0 SHA-256: 9520a1f91d29c0f600955432dd277dff91d9f0a5b537b67bc1f6bfff2d6db5e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/ganipisumedugemezetakul.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/20c7cf9d5d63405af9c07690cf504063/kotegopa.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/tewelimovi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb802fb9c---bejigetiwulemareniru.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88595185714.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/40756285935.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xudomufazexabetuz.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/58074366843.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/tosegedalubomuromixoz.pdfIn PDF document text
    • http://www.77ice.com/upload/files/xusunugenefu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a0e20f7f97df27aeb6e9382aadb1e56f/musilowulokabupele.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/26676928703.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/tigutosepukefutaxili.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/11773438438.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/95546377028.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a28e0c4e2f---kafoxupetudik.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/70789472312.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/2974288079.pdfIn PDF document text
    • http://lagrupacio.cat/file/31472243175.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/legudazi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gojadeterarakubefil.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/lidapuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ps4+gift+code+generatorPDF 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 10684 bytes
SHA-256: ce657692904b448d2a6fbb6bd09d8a8a81048bb4105ad54d23baf8b8145e0b29
font_02_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 17536 bytes
SHA-256: c79348376dedc5d1210d92cf0a933ca7a28cf74b1dba193d115e92cb702e9780

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