Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f0a799ac90a9f7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7cbdaf53513eb631d22ba7ea3a1d1fef SHA-1: 5723f131e472cac8b24ed3efb891b3d45d86ef91 SHA-256: 80f0a799ac90a9f711e57977ec781b92537e0bfdff91010907d610c3c7e7f0f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious sites. Heuristics indicate the PDF is part of a link farm, likely intended to host or link to phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://cobmedia.hu/include/46721401246.pdf In PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/xokonexefaw.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210907_113716.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/49651751802.pdfIn PDF document text
    • https://preciseenergygroup.com/media/mobiziwoduj.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906060618502808.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/ziwejesudekejudavaveneta.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613852118642f---72136434546.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76713667089.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/37084163844.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45875081466.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96751b57a---kibedopopavovepimezoxu.pdfIn PDF document text
    • https://adikketiga.com/contents/files/kekalazida.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/96414016555.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/kunalege.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/88362925986.pdfIn PDF document text
    • http://master-vin.ru/files/file/31112030996.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373916408b6---buxejinepu.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/dabetegarowelanemegofose.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/1776139648.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jumiduxoti.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/tibogakusebe.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63524396148.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/dutomufowaxizikaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+a20+teardownPDF 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_off0000bcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFA 17260 bytes
SHA-256: e28481f795c32f56aeb977cebcdf83053b8c9c2a54296072070c608e84676679
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 10564 bytes
SHA-256: 7545a28c34f9390879a16a72798ff5761cf1a8c59cac5a15d7d52e726d8be491
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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