Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3bfc42b70ea40f…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 06:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 384ed5e9a410f8e13b1f1306f9856da7 SHA-1: 76dae679963b6caccf5be1319884cc079f473b94 SHA-256: ff3bfc42b70ea40f1dbb30e36eedceab63589f707b3671ce3903485b3b5cec49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=watch+hansel+and+gretel+witch+hunters+online+free PDF link annotation
    • http://tlumacz-bialystok.pl/pliki/file/pavif.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bamopowoliwisozerakenusir.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gipisezilupagamisizem.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/donovux.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • https://stormester.no/files/file/wuwegubedino.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fusemalifan.pdfIn PDF document text
    • http://abwessex.com/uploads/files/gifovip.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/4618266185.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bovolirewawasopubobolemub.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12584724481.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/1483720363.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/gipibulakedifij.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/66211462742.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sawamisib.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/mupor.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1d7862dea5c29630eaadb71d6c4d98ce/87883380243.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fukiwewofedadubavigipeza.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b84619c5c5---44237216827.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/nuxigixir.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68199861799.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151339a06252---sojofosutixem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bbc6b1a1---12161200135.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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10932 bytes
SHA-256: 365a0fa665d94f3e8d1a9695fadae6796d593869926825b19de767222d270e17
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 15144 bytes
SHA-256: de6c660430750e1a637bc3223a898a81cf7b5bd06abb74c4bfe9d14f9a9c5246
font_02_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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