Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c4952ca7bb05a3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bda961480118f254f36b5323d0defdbf SHA-1: 8d09eed54ca6cbb5a6d51abbadd69dff035d518d SHA-256: f3c4952ca7bb05a3915afc0212f9554864d0f0868af2ff41293677df12cb9649
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the linked files. The presence of a download button lure further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac375dda4---87583352990.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e05354a8---ganazenez.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/28255875357.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/naguxamikedomilegasad.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160848eec1b477---27319390989.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/3397963990.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/roduxutoxexuzisorod.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wakuzizemezeze.pdfIn PDF document text
    • http://imbirimbir.ru/files/gevajerekolupuvolezaw.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/bixuvowogoge.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/bivifagekiteselivibuxi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/todilo.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/nakereme.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dawemipoke.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/65966378909.pdfIn PDF document text
    • http://heureka-cz.eu/files/mojuzusase.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/kozamusimi.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/30302495631.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0d409676e---53416597970.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/jixofuzikis.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210818_407728B70E6F66AB.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/jovuvodevopanexoluduzinu.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1629506558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pdfbox+jar+latestPDF 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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 10524 bytes
SHA-256: 298df1db1253d9643562ed73a1c1bdd9e8961d800d82f96a4e8f5521d97faa91
font_01_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16684 bytes
SHA-256: b6d736ccde1bae4f7f00ec1b96ab9ebde9a39c5271937254af20a196a7a1f468
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.