Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae87e46cd32c927…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcf464d5b2a2164d4af2a5f9e973e001 SHA-1: 8171d55ed76a1a26e2e2dd2f005f24057de6e0ff SHA-256: 3ae87e46cd32c927c46e83eec5de50bf027e1a3b51a6afea38a4ebd8a98a5828
204 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites. Embedded JavaScript streams are also present, suggesting potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://goang-hann.com/uploads/files/202109061835315334.pdf In PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32661632423.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/15207666183.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/54993152175.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tabamuli.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selifeloz.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/gopuvixuwawoposibazex.pdfIn PDF document text
    • http://bscartridge.com/pic/pilawolaramuwoni.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6384fe1---sawujuneno.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6da2731c1e43441579631cde598f65f0/32429062182.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/zuvalaw.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/36029780359.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/debujaluj.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109020048108130.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109160211589332.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/1386122803.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/6917094111.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/refovoxikepavidigidenugid.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1a902777d09cd9fac3df8ba4b3cdd515/tizuwerabewobudo.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/visekerigivifidikeruz.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/24750243307.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/21682339450.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/63987309190.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210909125403_cb51w4.pdfIn PDF document text
    • http://chinajnbt.com/imIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fs+20+apk+download+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 10656 bytes
SHA-256: 32326338a7fb64267f709fbf66ad918dfcb313bfbf8080c9a01e43e236b8b545
font_02_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 19544 bytes
SHA-256: 53fe890d67849c9885ace48232ce12d1a94113bfa4e508eac0929320feb0b1b0

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