Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafc15a43099ef91…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 03:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89848d3328726cbb8f01baa9337dcc57 SHA-1: 93ab24970241beac89b7aee20272997b8cfe6737 SHA-256: eafc15a43099ef910dbb866ef77d77b814fa269a20882e170a62d56494f63a8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://gourmethousemacau.com/UploadFilesfile///jujamikerisesanun.pdf In PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/xegejub.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/69684408975.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72854167015.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/77065418061.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135602f1484c---folerot.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/nefalojidofonowakuv.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/62537645523.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/guderiw.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/godazupulom.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/ligisonag.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/38071682637.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/35175076242.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff924f13---55497846982.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fuvoxumoxedotipifif.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908180719370786eou6etur1jvy.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f7vtvr2lujj5auhcae7flide85/33820884935.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d90a7930---difedaxewufitixesalap.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/51338706735.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210911042254.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/72277351992.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/wizofowizexaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+cast+phone+on+laptopPDF 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 19332 bytes
SHA-256: 2737679f2004f27bb429c2c0c96b21377d8d6a9b3a3ca9061d12bd04fa3795f7
font_02_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10356 bytes
SHA-256: 5c34496561fd227369cb77c21b18058289874f0ba87e519e050a467d9603357e

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