Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b6ce1590f4de33…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 19:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaecbfc5353e3c61e13b8365a05d6fbc SHA-1: 20c6b78eab9cdf0687281f4ff2053e6b610621b6 SHA-256: e5b6ce1590f4de33dc58d55c00926a1e85234009c4b8fd48187ec5e6db4ba4e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, reinforces the attack pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=yugioh+win+conditions PDF link annotation
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/65229350468.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/gamiwapuzof.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/10435359533.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/42512508830.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/vewuvasezu.pdfIn PDF document text
    • https://equimat-cheval.fr/file/gifurub.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/mutunidaruzilo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/gaxobowonunovebadaj.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20211001232804.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b620b66406---51730962080.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/zetoludu.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/55163420285.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/denejawenidasoni.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614542758ad16---lomotef.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/58909376820.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0f3dfc4f41d40a66743e0744b38951/80412573884.pdfIn PDF document text
    • http://rilta.net/userfiles/files/voxojizodozuzanazetel.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/basidevodulekow.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mrkcjb0hqgs06qr8s23dug00a7/jipozuxukowiwunobagij.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/kadesuvozavawabisosamav.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16152fa3728a06---7903516144.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wikimiliwononivag.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_off0000acfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10380 bytes
SHA-256: c1861c0db84b085786bc4d1f3d7423942e65780c6600026e948350fc21486d7b
font_02_sfnt_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 15612 bytes
SHA-256: 3521eab8dae5819d78b26f777345c6804daa30469314ef52c5187068cc1afcfb