Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e9ad6c8390af03…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 02:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8389cfb5238a5fd8b6daeab72a81e29a SHA-1: 1aa39b4c8a207897ea78b85617ffd3fafa96a790 SHA-256: 48e9ad6c8390af0366e7d70049accefa736f18b4f6fb07605010ef607e5afa4a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure as a link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=intelligence+scale+pdf PDF link annotation
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/rudokiv.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/13639621034.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37439520832.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nirasusi.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/mowobivewopafoko.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/16809934992.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/jugirexobowozavivuju.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xalelomunalofebinozexezug.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xitenozirajifad.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109140800425618.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rajiduzatenosomab.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/dazufefejalonexize.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/70113756199.pdfIn PDF document text
    • https://suksesunited.com/contents/files/lunalaji.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinukozoxivifamud.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52881756761318166dba92.pdfIn PDF document text
    • http://ustunongel.com/image/files/wefiwijire.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109041705191798.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ad75a008---panuvewekipe.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/zaragubasepinam.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/20883502866.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d65f406694d8b53b9158ba5903c417c/42727427378.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/10719551940.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/74558171262.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fdd7562aac2ee0305bfd64e2ff7b7008/80537255744.pdfIn PDF document text
    • 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_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10524 bytes
SHA-256: d6ca37c3c5e225321d2cd31fa73572bcefdb9d9682ab3cac1f11d68e6759f96d
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 18552 bytes
SHA-256: 59005c1e80d5d100c01696c2ccd38f9a76d6e2ce49229a9f8c9f74981c316bd2
font_02_sfnt_off00014a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1