Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77800041c0599db…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 00:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4efbbbc02b448e220927b9dea455bbb SHA-1: 7490b82b89488a7cedf47b45cff8a6dc2683a006 SHA-256: e77800041c0599db8b22b06a4c876f689efa1ac6fcbefa3716ba5cfd3abeaead
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://vontobel.shopbyeberli.ch/userfiles/files/gonovedukuwuvapufodikojox.pdf In PDF document text
    • http://aatmicscience.org/asuserfiles/file/walefoxeduxe.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/ledabu.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/folerokafiruxal.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/86875360848.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vedafosuvafe.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/307154963.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9359cc8ca2---10897996453.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/dokowafudisupinul.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3c1aa167cc7f6e72443ceef56190c773/tuvukaledogesilowaloga.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/keposomoseme.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/n8e6vruco11qukh9ovo2rbe073/25914206177.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/52509884906.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4735ba5f---18014024858.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e07d9950be6c674cab6ac701354385cb/borugezovuxuvor.pdfIn PDF document text
    • https://steammining.com/userfiles/file/potofu.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/badegojefomobelasotisibe.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-07/images/files/zukini.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/tedatikewu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c8ddd05a---xamagoruxu.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/notepajek.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/10114587138.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nizuxejojosexokuj.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/9697488629.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/latevuwuxubez.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/vovagop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=child+and+guidance+centerPDF 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_off0000ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 10492 bytes
SHA-256: b361a2e81ca9511f6497733b54e096171adab80840b6093fa52664b5f9d557ab
font_02_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 14620 bytes
SHA-256: 26f6d800a658b326be4b80917d0475bec4f130a57a7329438833f6ed4d3ba330

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