Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0041e71b8548c17…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 17:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb4702d16fb0e711fda1e174c389139a SHA-1: fe6b2b58d7b7a5056e0703ccbb26697b5ed57789 SHA-256: e0041e71b8548c1709170f6404088950931560a50fd4216c936ff79b9a780cbb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dxqzx.com/ckfinder/userfiles/files/20210908_064958.pdf In PDF document text
    • http://yachtales.net/admin/userfiles/files/fawagokosupujozuwemewuva.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/48579927365.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/xolatefojivenixom.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/rutepululugorix.pdfIn PDF document text
    • https://campermagazine.tv/public/file/jozupesaral.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/gubebije.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9qh7dku2aq3ve5usiapjvn4gq0/70066140955.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141ec3e24856---sosupogodululexusijidi.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/toziketovixilexuvamok.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/nisakugulonijegavomude.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/30552833748.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/puniw.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/jabubelanup.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40401762422.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131a21ab44c6---33883152961.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/tajolugakofe.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ramoduwubivuluselojafowol.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/kavazi.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/70218704673.pdfIn PDF document text
    • http://llux.vn/uploads/files/81764879966.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/89761210847.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/bupem.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/luxuzuwenedizojoniwas.pdfIn PDF document text
    • http://18554080.com/userfiles/file/92815441521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mi+a3+android+11+release+datePDF 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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16640 bytes
SHA-256: a90426c6a75b89aff75654041bd256e25035b2abb95de65cd42ba59d3292d64e
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10456 bytes
SHA-256: 780e8332147304b76d9b77400726887bd28f7d7a48efc6d98d71154b6b865a3b