Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c22bd7c4b060029…

MALICIOUS

PDF

98.2 KB Created: 2021-09-06 16:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18899535f6202c17fbb2bf77dffb9d14 SHA-1: d9c1005db0cfe4c7c9b2eeee1f7f474fd369e01f SHA-256: 7c22bd7c4b0600295b60cdfaa20b6086b4c638209a45fe6e8ea565dafb25931b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple external PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure or dropper, redirecting users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://teamcode.net/upload/files/nefezarinemeno.pdf In PDF document text
    • https://syteq-pro.com/userfiles/file/gebase.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202108240815562363.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/64068859230.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t2cemlalc6co8vndvgcnssp0r5/82671538967.pdfIn PDF document text
    • https://appfacile.it/file/74570845680.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/jagamapafowub.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/gijogijareriboxexoxew.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/38993797851.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/knl205qqqnodhqbs8qbgjvgoh0/24659329063.pdfIn PDF document text
    • http://tyextractor.com/d/files/86367995900.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a269036b---xarekowobojozuzonam.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/13743986066.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/wokilatupibagigowakut.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/666844e8995bc4a3d08d065422eda03d/1622843070.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/97196745000.pdfIn PDF document text
    • http://alltechsro.cz/files/65530184017.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ad013d4---58560476256.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqrhinqktkbsgr717220s8ji49/55081063060.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5ed9bd0998cf5fbef3c12b6b6a90bf78/tajorelarizi.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7fc3d52ca3efb0c922e2def922f2a12a/rinigede.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210617_A1BC27E2944C9CDE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=intercultural+learning+pdfPDF 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_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 10560 bytes
SHA-256: b7f9c940234496b1faf1485c743f02cf66c9ed61e9c2e6be18ba1f2ee669dd4d
font_01_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1C 19060 bytes
SHA-256: 3fb0dfbfab21e14beda0d43584bd0257b5bd5e52f207c21a6bc702ed19501fcf

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