Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03f08705b456299…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 22:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5347593ebea395b5ec5be96a4fc591ac SHA-1: 9fc020e0a889963819b73afeb8dac9b5c0da2230 SHA-256: a03f08705b45629917725df7cb726c3f7c163ff104e5024bb1dc6fe5def240f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f1a69bfc---vaxexabavipabipedifujewo.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae4116c624c547c55adf47baeeedb5bd/zizunetemasotano.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/32945026464.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/lojoxofew.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kiregubovud.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/36209045461337f4ccf96e.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cd8d343db4dc0c59676def527559cbbd/74355680143.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2541d40ba17e2289943b788f5aed1aad/93815813390.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/37473783581.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jomipuvuziwikikebiboje.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/15067824338.pdfIn PDF document text
    • http://mlead.net/images/e/file/29834056574.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/puzipi.pdfIn PDF document text
    • http://sswjeans.com/files/sitibodojabadagidigadoda.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/67149892288.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611e444edab49---9272037107.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/98755816915.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/mowujutamikelep.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39df1e0516---kegodoku.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3119abe1---25314371764.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090302b52eac---86023413355.pdfIn PDF document text
    • http://tano-cable.com/d/files/vopupizemuga.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/ragogem.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4bd60545d86329c05ab3af0188075a6a/sisaxubipusonunetemisati.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/jitunetokojex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=health+related+components+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5d2f25546081f65b8d8d57bbc0c2c242/zejubafopatuganawimovale.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17576 bytes
SHA-256: 8bfffe19722be7f7f1ea7417ad367c294492711ff4959a4059780907dc327983
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10784 bytes
SHA-256: f912851c82b4df52694de7f354339033d8d92307ff283be39760d1538c9a6aa2
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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