Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b92c9f734b24ef…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 20:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c39ff901f8c3f9f65725b863cd47420d SHA-1: 48bdc259028a54339e375497107ff813ee8c9f35 SHA-256: 39b92c9f734b24efd51ffd54b367d9bd870958bb45864cb1c79b32147801f7c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it is a phishing or malware distribution attempt. Multiple heuristics point to the PDF containing a link farm hosted on various websites, some of which appear to be compromised CMS installations. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://zonwering-belgie.be/ckfinder/userfiles/files/36102290668.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3d91dbfc---xadejorejavuxujololinude.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/6200186869.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/gegifo.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/343965c0802c2603e1bc47062f90e0f6/3377241243.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r4400pvjbiiu1d6mb0cbu8n6fj/31561780257.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210827195717175.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/wubonibinixek.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6add15096---pivesovujot.pdfPDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/80dc5e99a9ce69200442372c2d065734/nanidoxa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc80e56669---wilowotukes.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/pofozimato.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/70957192432.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/zovexuvapiw.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac832eb8054---67690504942.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0643436b1341f48396568e49386eca53/xapajo.pdfIn PDF document text
    • https://robertbah.si/files/file/62389470347.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/vovunipodalajura.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd6a2f1f97---fugezop.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/de8316f001cd6c55a5fb3f56ce494028/doritiwofefigomed.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/misitanuzarizaruwitu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/40b7481ffa6c316a8ef12cf866ec7054/31456776475.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kamub.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/jigarujijogi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jqr2nhbbok35rrpq9ml9lgm9g5/46776309102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=prepare+income+statement+from+trial+balance+example+pdfPDF 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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 11024 bytes
SHA-256: 3f4610afa334fea38d9d42af309cfe4f323ac7a99264509e0f6e199d6be7816c
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 19232 bytes
SHA-256: b48fef97c3fb4d94e7739e6040f32ba77df8d585c5735c9108901d6c914c4abd
font_02_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1