Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d123aca624c1000…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a53ba81a961c9ad711408a7270de69e4 SHA-1: e515b58e9f43a01e8057c06e46350aeec00f7b8f SHA-256: 6d123aca624c10006c151060d15525bd04d081a5d0a4f52e6e397d34c341a5d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://journeywithmypet.com/ckfinder/userfiles/files/vogavedezidemaguti.pdf In PDF document text
    • http://fanghsin.com/uploads/files/202109140059054575.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jazobuzawuwujov.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8b254c00e1d7a41cf7f0d7fdf6bd433a/risadejunuge.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/xepobodiralukarokofujeke.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210901130845.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jirulajafedupubu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/eq31tskaluqp4ohlj9l4atqdg7/56362457608.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/29670456449.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/93236012679.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/10702153317.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/95006675587.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/93453847463.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1ap6mrhlti7uoj7nks3pr8qgdq/juwuravi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/14850875872.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912190911356.pdfIn PDF document text
    • http://esistore.com/userfiles/file/27884615897.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/pidumufo.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/6919345390.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ca37db13bf860c6732e43fae62ff715/biduxubomisilaz.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/bibofororoxatodifesuderow.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/xububexu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de91e69759---kobijoz.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/bapigaduzavovuzijugibeg.pdfIn PDF document text
    • https://maviet.vn/upload/files/kebonufamur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mohalla+assi+movie+full+movie+hdPDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10476 bytes
SHA-256: 2f3f8a05099166b23f91f49bcc65462f9c3766adb319dafae1f6b354accc9fbe
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 19244 bytes
SHA-256: 75a31e718f31e2f3623fa40a777a26d2227d7e42b7036d678c3c577c29ded039

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