Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff5c75833ed83f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 08:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc1a78b1b78d372d595312015cb1ba05 SHA-1: 721a7c8a5e854d90f4add707b5da1d5e9688430c SHA-256: 3eff5c75833ed83fdf310d4100fd122e3146e90cf633e20abfe4aee49b347281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs that lead to other PDF files hosted on various websites, some of which are compromised CMS uploads. The primary attack pattern involves directing users to these external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bloomeng.com/uploads/mivosawewagi.pdf In PDF document text
    • http://mvhs78.com/clients/68382/File/debodetetewewog.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5133b84bb---juwalukajotorodimifenavub.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/84505596957.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/csidcsnbul6bb043lutp4nvkl3/68472402578.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/giworimumebugekumima.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/43682970033.pdfIn PDF document text
    • http://terminsk.by/pics/files/pepojiwiwatiganamotu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ae84e5ad2d2ef6dbacaa708feba41b7e/5005759755.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fomavinidomela.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/sezorikadujilapigorip.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc368e4d2---wogiduxizopazokow.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/31051398015.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160794c04316f3---rorabiteborokimo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vivadovanovonido.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4367974205a1e2ac2af38b3f1c86ad0f/90915207762.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11058727---lugatixodevubelogusudo.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/ranizovajimiv.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e82421c5---gubaxalunifukopun.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79887456013.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a1a1b4da---dafasiva.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/8388783895.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nubaredik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+convert+jpg+to+pdf+formatPDF 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_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 15948 bytes
SHA-256: 2f9f473386eab7cc8ed880bb0acdc7907bf8b29b1cc79a1c8d3ab46462df25b3
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11020 bytes
SHA-256: 04159cc50f4da4331de0853681482ccc9f348e902fedc72bb62cf27370f945b1

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