Malicious PDF — malware analysis report

Static analysis result for SHA-256 993aebc7422f5ee5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 19:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04c6eae16d64513c18d62850fc42e58c SHA-1: 0c43f8c8df7fa9f0a3fdc8a212188fb2490548d9 SHA-256: 993aebc7422f5ee53b53ad4f1c20802f532be097c948483b701e512372d4e112
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://domesticsolutionsagency.com/userfiles/file/19521325605.pdf In PDF document text
    • https://granitabrasive.ro/editor_up/60138957185.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/39273190724.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sijutofumabame.pdfIn PDF document text
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/61253344331.pdfIn PDF document text
    • http://nktrading.qa/file/files/39207841826.pdfIn PDF document text
    • https://ghnservizi.com/file/jigopanijokoredad.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/19802609177.pdfIn PDF document text
    • https://parc-hotel.info/file/2672832235.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/javopodukanemerajopukud.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nopefiwima.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/15690117202.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139db7a36c44---21831766045.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/jogiwevanamebaterekugi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/93567870020.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/wasirevoragojedexe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613449afc8949---waxivirazanitujo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/bojaseges.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613360a407a70---75676188126.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/87801017933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=usar+android+como+control+remoto+pcPDF 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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10684 bytes
SHA-256: 4c3340cfaabfdf256be1ee78fad27b21cda648b2db1465b2ab7c93ff46c0c21a
font_02_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 19992 bytes
SHA-256: e18aa0294f8896d815fc43649e393779a89f7bb90ffce9eb1b356126404ff994

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