Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdaa5ae3efce391…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 21:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c72dd2549faaa61fe0e29b45da92dc5c SHA-1: c3198843aacea8866b203308982642e84e200397 SHA-256: fbdaa5ae3efce391d9ef7f0c17695274edd7115aaa492ec39935cca9092f93ed
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features numerous external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://perles-del-beya.com/userfiles/file/55950404249.pdf In PDF document text
    • https://socohoteldanang.com/uploads/image/files/sisototatogujugepip.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9ef4678d64dce0c29dccef02e651d8cb/21746620357.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/bebuwedutopuzalu.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210807050336.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/linaxujubiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tumikedale.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/13115400795.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/17703016541.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a4887bf20---duxafatoludotororimujax.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/nowoxapiz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/54798723538.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c15c30eb95d70bdf957a6c11e49b3d5/15057788024.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/24865900110.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/zobowikixulugowifulizor.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/kirezogaxisiji.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210826154449.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/9954069021.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4e81c8f1e---85585068427.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4g42sv38ief431r3lgqop32835/gutedojuvijow.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a837fc2d7d---mogugolofimome.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0aad7ff191a350104cacc1cf702e97c3/netadufawoxinumu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/diluvovivaxisarukesuli.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c7b483ea5e97c239a6d19a80f7c45209/60029495260.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/61656087524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=la+r%C3%A9volution+fran%C3%A7aise+cm2+pdf+evaluationPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 11376 bytes
SHA-256: 4f4b8aae3772d3d0010cf6c9f748c3b474d60462499c27be03d7920672ef5058
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 20648 bytes
SHA-256: 6622858b36eace45d0eeaa42e96e821043d74f37159942f701335a0a7d6e273e