Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5ec9ee9b19a883…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 12:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ad50119cfe5c0494bfc299ad643b4e3 SHA-1: 08d3b035514ffc2beedb7f34dd800ec4ec1fd6ea SHA-256: bb5ec9ee9b19a88360d6abce988588dc218430602f8363c570cec8db26c9f4e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a non-clustered link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic further supports this. The presence of these links suggests an attempt to direct users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+check+password+wifi+android PDF link annotation
    • http://ogcdc.org/uploads/ck_upload/files/jawuroja.pdfIn PDF document text
    • https://premiersuli.hu/files/files/gitez.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/jufavokoxumigo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/90745609246.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/44978929659.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/76836794323.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/zalexif.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/tigukogamugig.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec0e5ecc4---kawuzulezos.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/datonav.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27324913404.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/36744072114.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/399bcbbfbce39d293c9494c11da11bce/xokovavel.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pewonupitixufexur.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/85og6su6t9tu2tl6aldjvc1fdn/56829932390.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/simezagemaguvipufebajo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6rtlaaf2cnrqin10n9r6gefefl/wedemonimap.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11182990273.pdfIn PDF document text
    • https://verner.lt/images/files/laxaxalimaxudifila.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/madisavimuket.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/datewokimijuvusidekiwo.pdfIn PDF document text
    • http://llux.vn/uploads/files/61228548589.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14472489289.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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 10840 bytes
SHA-256: d5d05a4ee2590cf732d8479688d11b040c5d090c99871922de39adc4fcc50c31
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 17800 bytes
SHA-256: 1bce80bd86adaca27575806cefd91ed8cb81f216ed57450b8b42d87100694df8
font_02_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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