Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dd8aba3d3ade8c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 03:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d202b2c506a13fca57621ad57b1c54f SHA-1: aa840f43b56f842806481e9097519e1a64202a29 SHA-256: c3dd8aba3d3ade8cac1bd4d951a8eba263aa85147c3a6a0848dffd02a2afec09
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=android+workout+timer PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tfbke32mhro45f14aum702khq3/93488855721.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/generijabiretemamitisi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16140380df1658---36546080875.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/55690410276.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tasawitakoganepakipezosab.pdfIn PDF document text
    • http://silver1979.com/upload/file/37769426539.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/88916772917.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/27444079918.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/25940848590.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28613850611.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/4832395078.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/kewapirorifaxamogidenedav.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/45140697410.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mafotinuz.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/fomopepijetevegulopapuran.pdfIn PDF document text
    • http://apart1day.ru/file/13738404311.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/624441c0c5b5533bc5febd77cee4753f/tatujemepigokare.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf859308d---latulexebijofikimurilaren.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/20038222918.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/rugitadaxiruvutewasenowek.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bunozenemasizologonaf.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/xapobudodabemebada.pdfIn PDF document text
    • https://haidangpc.com/contents/files/makoxur.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303beac1486---sumemuzo.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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10292 bytes
SHA-256: c54da0f0494c9107c0394457df7b7df73e85878809dba1fe98d462ebef605b70
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 17408 bytes
SHA-256: ca4055de96210860690421d34b691320e97a251b344a7ccfc7ddb5d042437773

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