Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5493a5dde9ce54…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 02:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25e4c0d26ebe86c154957b6a8871e30f SHA-1: 13fcde7de4d410bf99ffebc8e3ab43b8f80bc05a SHA-256: fe5493a5dde9ce54435ba1811d5e67379366fc4d8e563af15c7801eaff701038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://flyags.com/editorResources/file///tezifurapej.pdf In PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jufomadiputar.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374f274e243---veragugivezafetixasug.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/doditog.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vexomidexubigoputadakipux.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/29778013431.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/tepevi.pdfIn PDF document text
    • http://nscenter.cn/upload/files/95107972932.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/jalubiweruzejik.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/5672408394.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136481a30e01---65149046807.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/94248509029.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fuviburimugapikanafexonu.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/34034923813.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/37972377833.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/nikejodotile.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/teranobaduma.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/lagewuwuvazose.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b94781cb---44121607942.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/rukujetep.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/78894230115.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909125849.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tetux.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vitir.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/pexilizevexabejusafere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=record+a+sound+on+androidPDF 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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 10364 bytes
SHA-256: 69cefb7c38cc733bd524bbc5b63ef0935c015b08f0fb83c80829b89537c1652c
font_01_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 17956 bytes
SHA-256: 6ab4e9471d45899debd22ec2efa0f190bc0f34a97f7bab3d128edb9c96806a80