Malicious PDF — malware analysis report

Static analysis result for SHA-256 098638017b8bceb4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 06:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48a63811c4bfeb25bbc341beac77d13e SHA-1: 0495f60a856665c0b46ffa6706411af603b1c105 SHA-256: 098638017b8bceb41a6c70488bd3e22c382f98c9079e71f4b8d86a3465ebf015
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f6f7ad2f---fifexolo.pdf In PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/walanurovanekerixuzusojal.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ceba7666e---58498155350.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/91090807636.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/32447352341.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/76414142910.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8cacf0ea---xarorul.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae49e99a7---pabasoraribovuwudi.pdfIn PDF document text
    • https://digireg.nz/upload/pobit.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/78455783053.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ebabd6ca55046e9ceae02b7ef017e7bd/xadedenepopek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9aee9b648---tikotigawemakun.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/15e3l27abktfuockvv12c8v309/femomelarivoxanujad.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14edccae5---83146147251.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7136d2d388---98045157463.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lefuxazedakuradopib.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5ac5090d---92399669493.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/galigipedibobunetofod.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f4071ddb86---simap.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tinejowofagefiwufavutavuf.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1628777929.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/601e53bd3a4d2c285378f7485e72c4ab/zumetunu.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/93865298685.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/16369707897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+make+a+word+document+a+fillable+pdf+formPDF 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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 11136 bytes
SHA-256: cc070950bf436ba7c2354fe805abf1a714f628ee0595a527893ab36dd0581fe8
font_02_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16980 bytes
SHA-256: 51ed8d26ddf701f580e23c2b444eeee3c96e7fba9690f4213fdb2cc8d93dce2f

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