Malicious PDF — malware analysis report

Static analysis result for SHA-256 5171587a7fd92ff3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 04:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30d136c4e535d77761b52e51a26fb7d2 SHA-1: 32805e54595b721a47070921688ee9cf04170211 SHA-256: 5171587a7fd92ff367c76a5523adc80723b8251f1f7085a22133fa2110944e5f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://anthonygillant.com/userfiles/file/safosemetogekodegem.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/60944062212.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/29984363857.pdf
    • http://chinahongji.com/d/files/74530178637.pdf
    • https://tatsolarlight.com/uploads/files/pusuw.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/93304217050.pdf
    • http://abwmechanicsville.com/uploads/files/pofubewuzu.pdf
    • http://ilkjv.com/Images/Media/files/pewovow.pdf
    • http://sowiik.pl/userfiles/file/detid.pdf
    • http://jn-zhsc.com/upload/60403294729.pdf
    • https://jerseyshorepirates.com/userfiles/files/tapejir.pdf
    • https://egyediajandekotletek.hu/mvc/userfiles/file/dodot.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136db75ddff6---sutasatiminimuvigevizu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nuhdhtj35a20kf0cddua8anekq/zukijiwamebepiwoxitu.pdf
    • http://zkqzl.com/uploadfile/file///2021091405233724.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pevetoluboxekutugeku.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wamajavinaduterakazakam.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ac19dec6edd9b802b2618f703ee76b3e/pimuwubapewinepeb.pdf
    • http://nguoiquangphianam.com/uploads/files/wavanod.pdf
    • https://refakatci.net/userfiles/file/senezetutevi.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/41869593020.pdf
    • http://jafra-com.at/userfiles/file/juvesozawixo.pdf
    • http://gemwishrs.com/ckfinder/stones/files/2384985145.pdf
    • https://tatvan.in/userfiles/file/43205371676.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+free+for+android+mobile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
font_01_sfnt_off0000df74.bin
c09037388ff5aebf57a22c5aa0f4650fbbdf69d3375f406c865bbb6f65dd6cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16064 bytes
font_02_sfnt_off00010867.bin
dc6eba6a1f19d16bab9cb3eff99ef74b627d8a5faf6ddbedad08787ccf9b54a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10604 bytes