Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cecae9b7400250…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 01:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d10ec3f9d384347532ceb2bf355864f2 SHA-1: 70645e4e8ffbfc6f15a54ab7bcbbf06e6cba180d SHA-256: d4cecae9b74002507c298cfb84f6644ba03f82c1933f250d0cba829299290df7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or host malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9014

Heuristics 6

  • 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
  • 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://salwangurugram.com/files/10384248826.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/rutatosoriva.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/60462963699.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/dugutiwe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17c3e5d9a---kaxasepabig.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/5d5a463ee7f07687df9cf974ca506a5b/xukozubakarivirojizebij.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tlrq2alcqkmrnmshptc5cljhs1/ruvafudawutixe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608056e8159f6---57646180797.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/639526c47ec894fc3c0747ce86d7d18b/53897965104.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/zoludadexepekuvaresava.pdfIn PDF document text
    • https://mszukam.pl/dat//file/85536035170.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50c58caea---8623768477.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/78432699969.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8472113c779aa0952dddc7bbf260e2d3/makidawipajawonafowulojer.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/td720b7fiukmbvdhq1lflksh9o/7561509947.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tunatimapupogajo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d879e4166fc---wulobexaj.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de7ca0e11---ronojuberodosuxobilavire.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/vivegekimimened.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/46308556188.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279fd0b041---97206224660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaaad00504---xojomov.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/04b6c806fdbda72e336180933e3806ea/81242723198.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff68e1a9a0---wakimajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=zombie+hunter+king+hack+apk+2019PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 18564 bytes
SHA-256: c27f77d8ddaa63897e0a265731cf979028dbb941c067c44e87bc747de8119ab4
font_01_sfnt_off00015a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1