Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb15f678a0f7dfba…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 20:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae0dff89519750b3b923ec761868976b SHA-1: a30d7a02571f63610023327652bf2baaf7c95273 SHA-256: fb15f678a0f7dfba3e1e65a81a62d5b858026a776ed9ffebf44270e1495ea9ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of embedded JavaScript points to T1059.007 as a likely execution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/95803885337.pdf In PDF document text
    • http://at2apigroup3.com/contents/files/3390502435.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/77355149424.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/sejafivufefirigebakuzini.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/logosebufopewujosifo.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/95582162163.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/36150271565.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/38424658630.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613387e16ff8d---44835482425.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b8233d02---6077530508.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/50168392117.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd9aed1b7---mavodadodukika.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5174cf39e48adb35322b476b63df6b84/malovumuxakijan.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/1139581418.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zawewosuvetod.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136077858518---zopivaxetugebirilizi.pdfIn PDF document text
    • http://carbonelite.ru/file/64840832315.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b44e0858cafeafd845b55c811e847397/tetuzun.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/15820377070.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/181c492b9245a9aac9dfe19f243856b3/29992551522.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/wakobudegokebogex.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vovusavuka.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/zedonokekokugejuw.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/dalowugixirileko.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/41858091660.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/losapelifipajodadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=voice+changer+during+call+apk+downloadPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10776 bytes
SHA-256: a8b566242eb50b1cef7099b949df40e9ffc7d74ee74ff8eb9f366ea00f9fecb9
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 18176 bytes
SHA-256: 2f6a6164f926a151aa8f31deff1d3f00eaddfbd15edfc955cd45af71d4b5b302

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