Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b15115466070af7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 09:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ebc2b84efc61c97d3c807a4aee1bc66 SHA-1: 01f612e7e1341008493e87a81ebcb9a0564df4f6 SHA-256: 3b15115466070af7359a19f2ba2c4b080faffff77760f4419897cdaad594ba19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=how+to+change+location+in+play+store PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df7690b31---57649885699.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/monezubuludul.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/regetowopiwu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8bf453a99b1b6ae7e35e809ed08cb689/31922488450.pdfIn PDF document text
    • http://alvitraders.com/files/1256859989.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nenatoxuparefolikagun.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/91241085796.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/42371624100.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/pojokowokaribak.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/tuzen.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161355f1f66356---96421392946.pdfIn PDF document text
    • http://htwy.com/upload/file/lopidetulapuxisogekera.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/patijumog.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gimanube.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44611854146.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vofekogut.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/35153814209.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/598262501.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35771951250.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/16318474073.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vonuxixane.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/sororeravulezasaxivop.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/83834576347.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/35866132235.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329d637b225---18041603743.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/18611728590.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nuraboxariguwokunajaku.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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 18044 bytes
SHA-256: 9ba491f20cacfdb3fa1999aaf92247a6421eae6e940e530bacb3c24c23bf2967
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10844 bytes
SHA-256: 1e5d06d73b069efcf0e7cdcc0c1e782b3dc87b3abd0d5eacdfbe9305eadfc964
font_02_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1