Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a83d407ef15a6c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 14:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0363bdac557a5ee3b4460dc835544e5a SHA-1: 8120d63f9db43fa48d1cdfde67156914b5973423 SHA-256: 12a83d407ef15a6c4be32782e48d58ac6d749fcadd513037ffd4daf7fedc233a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it is used for phishing or to distribute further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a spearphishing attachment (T1566.001) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://philabc.ru/uplcv?utm_term=cleo+san+andreas PDF link annotation
    • https://testgit.begurholidays.com/uploads/userfiles/files/90997511941.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/33389777395.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xuwiponixamug.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/savasowiwadop.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab350bb69---54524386152.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/98463176846.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/dijimomutejebos.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sedip.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c115e8235e---ruvekuz.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/ruruxizaxikefig.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pilebekomole.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98639691271.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/95892187726.pdfIn PDF document text
    • http://alkanboya.com/files/file///petolubugimeli.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/zopedatugazilos.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090610573070554.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/47818507259.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/32737536466.pdfIn PDF document text
    • https://ccskin.com/geektic/files/6183906756.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210921162823.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99fa797de---31043418856.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/66772168161.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/58729433652.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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 14712 bytes
SHA-256: 0e144b322343b5f50f03da1ed8055f338c05302399c1978e95fc6f6e1385400a
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10080 bytes
SHA-256: 4d9ed3bccece536ad78845dbd8c3735d4eb32fb30fc665595ac1b6e180685fc2

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