Malicious PDF — malware analysis report

Static analysis result for SHA-256 6584cc9cd8767049…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 15:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5074233f7a296e9fa50cde7668853238 SHA-1: fb403661855cdcf6511cb4f1176c1da50f41afa5 SHA-256: 6584cc9cd876704983027789d5186395c0a1d43b278da0f990247c977f0481e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads. The embedded JavaScript is likely responsible for redirecting the user to external URLs, as suggested by the PDF_JS heuristic. The presence of numerous external links, many on disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stayinbranson.com/ckfinder/triplebuserfiles/file/64272259218.pdf In PDF document text
    • http://agisma.ru/files/pages/files/41147837335.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210907025809.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368a5fb3036---ripelawi.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/dazelumatimirufuw.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/lunoxupud.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/71826534237.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/muvowetiwibevetategusuna.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/80594743961.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vasuti.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138080d25a67---54367128118.pdfIn PDF document text
    • http://amdind.com/userfiles/file/16851662926.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/tevobiwukivivofes.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/pabatotinuleduvaduweb.pdfIn PDF document text
    • http://novichiha.ru/pic/file/36841630378.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/95520584048.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/xigubowekasutupotazip.pdfIn PDF document text
    • https://digireg.dk/upload/24880342784.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613295cfe14d3---70685165775.pdfIn PDF document text
    • http://arucax.am/user_images/file/judogegenijed.pdfIn PDF document text
    • https://seikai.jp/free_images/files/kokoteto.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/sijozudilugarexobafitej.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068652c018---46569131434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=printing+sms+messages+from+androidPDF 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_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 17000 bytes
SHA-256: 86d1e0d23f5017bbfb4f501fc568ffede7a2ab1f76bbe77629dbf387ad024dc1
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 10652 bytes
SHA-256: 8c963317ca887684f105510ee993f3221f16329c130e0aef80da00d931beb457

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