Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbcf4d0cd93b4ab…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 14:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fa2377acec7e55b0327bd7500f7a457 SHA-1: 75f0b5ddd19f7ce22984c4428f586fcba0cacd86 SHA-256: 9fbcf4d0cd93b4aba4825960ad34ae2775ae9592b039f5a3f30fc4e4d46bcca3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and multiple links to compromised or disposable hosting sites suggests an attempt to redirect users to malicious content or download further payloads. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically points to links hosted on compromised WordPress upload storage, reinforcing the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.la-providence-ehpad.fr/ckfinder/userfiles/files/zovurakonekinotikexilemex.pdf In PDF document text
    • http://vindindex.nl/images/uploads/61684125339.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/59862479348.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/92123452666.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vuxozaxidal.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/94098575003.pdfIn PDF document text
    • http://iviltra.lt/images/files/11565674147.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/xozevemodaweronutiso.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/13de443a5b74d80ebbf050953d93dfe6/xesujejanefufexunek.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210912_3E938CAC46708DBB.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd69bbcbf9---fiweveniwo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/32457232099.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613db482e455b---41462099881.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/40407246851.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/vokibu.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/27823282541.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/31585790735.pdfIn PDF document text
    • http://eichler-kammerer.de/45167990049.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/70ef4ae977b77c49cc78fe058a523698/22389866755.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913125006.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/50889225120.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911212923_3i1gbz.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mijidusagixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+sdk+gpsPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tonimurozojuvezewamuge.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_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 19704 bytes
SHA-256: a176f5bea6989584f7abc3a333ff9ce6b5131a24051ea4cd034b4e763dc5e27e
font_01_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001409e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409E 10204 bytes
SHA-256: 8111d284b911b2b3011a36d1c86fc4296c3ac5ad8d80d8c925f65f7e96906449