Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c4d7891a84de4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11eac79c76f6f0017ae379e042e7793e SHA-1: 66fef28ad5de322a84b21db17a904cfe4d42c072 SHA-256: 368c4d7891a84de4f5a1e0c4cdf14ecffea06b464161b6c13495171141303a54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

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://hilimall.ae/uploads/files/63116882454.pdf In PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/94795128560.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/mijemazowiwex.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/66640630958.pdfIn PDF document text
    • http://www.heksan.com.pl/file/69746471935.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/jirezo.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/fatevigemerutod.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/87997828147.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911074634987696.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/tufifuxobimawaf.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/juxutenopixo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc28e7b6---97257739642.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/walowugabalapon.pdfIn PDF document text
    • http://stefani.cz/fck/file/34447576205.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/fiwiguxosaxemewavedibo.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/77368184644.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/baregatop.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/53701529392.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/14525625676.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/25249452527.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ebc1806ea---68342525602.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/tazazalobisapexis.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0326366001631844190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=triangle+face+shape+haircutPDF 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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 16992 bytes
SHA-256: b503e0c60d2c821f1443bb65b5a1cee5e79b58f5fb71647404bb872310db3102
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 10700 bytes
SHA-256: fb4e4774ccea0e15d7c707750fec5ccc1c9a75be5361d6a7077457fb90d16516