Malicious PDF — malware analysis report

Static analysis result for SHA-256 81849de301f3859f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 07:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b57924f396af28807f8f6540151e319e SHA-1: 09e89c92864897c3994ceee12d69d3eecda7ebca SHA-256: 81849de301f3859fc6cf2a2e04d93abd93d930b21be8b7dca79df234bf43189e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into decrypting and opening a subsequent malicious file. The numerous embedded URLs pointing to various domains, some of which appear to be compromised, further support the phishing and payload delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://shengnabei.com/uploadfile/file///2021090901101852.pdf In PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/moburibitomir.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/86227088668.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96491325466.pdfIn PDF document text
    • http://emaaravm.net/upload/files/10263343029.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/31731030365.pdfIn PDF document text
    • http://kd-council.com/upfile/files/23566014671.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210902_C108C0F497ACC2E7.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/nisaxi.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/95697191202.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/31700083251.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bfc5b6467c39c4222718cbeee1ecd9db/varuzozejirutiza.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/50975580549.pdfIn PDF document text
    • http://vit-physio.de/file/wozirupovinewaderifuzi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331fa31f5c2---vupelugebelufujojuf.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/reguv.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/76269115339.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_AD6AE38C8F8E6470.pdfIn PDF document text
    • http://zgic.ru/!upload/files/56978408664.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gewomazag.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/m951j9bq3kc8qntofutug9gr0h/78596439686.pdfIn PDF document text
    • http://njchemland.com/upload/files/xujugepuvafifi.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140746216995.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061c757c5a---ditilosusowolaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+ultimate+ninja+4+isoPDF 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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 10556 bytes
SHA-256: 9360059b77ea64cb2019a16bffe6a0087b619c9b3a91e556da527406393a25ca
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 18180 bytes
SHA-256: 19d889e108b6fd6cf1ed8b45a415884ebcc6e6db5e93c2711c68747d67e5a93e
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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