Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfcf9a13636b057…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 01:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 952d03cdec1d134854f7e52745f360ac SHA-1: 0723cc98c1b961d8ac81e2b1106641a283b544c3 SHA-256: ebfcf9a13636b05725bcde46de21648573b4e07d2b567471effd866e5c52729d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. Heuristics indicate this is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.willmarareachamber.com/ckfinder/userfiles/files/21685685660.pdf In PDF document text
    • http://youngshiny.com/userfiles/file/1630575935.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ed563e0---zusababekibesuwosekef.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gupiwupol.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c55ce98b9---xoxixabevi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/tafejavikomilipet.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/denaxazij.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/67811826739.pdfIn PDF document text
    • http://sswjeans.com/files/bitijifimajamepodesaxi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jegabime.pdfIn PDF document text
    • http://kmsenior.org/file/files/fivuxubanigetamasulizejob.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/jofufunowuzowimal.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/3600102197.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0a957644dd64e13b500e1148f73e75f3/21744716435.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuzuxigawevinovukapifimu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca22c2431---97981226924.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dojosodevetaturebu.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35723574060.pdfIn PDF document text
    • http://brlairport.com/images/file/4991081054.pdfIn PDF document text
    • https://loyd.rs/images/file/77591016951.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/waxiwug.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/75693252674.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/26682737701.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/70023454503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=moving+lock+screen+wallpaper+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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10828 bytes
SHA-256: a8f915519d2b00afbd6e3fcecd9222444df16b5a8ddbe7b121181161df681cfc
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 17344 bytes
SHA-256: f2e154681bbc75a4f28574eb78c77a85dbc6110415986005565e74ea1af32ea4