Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed768f9adaed1f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 04:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 555cbcf1f692bdb31b2f573b33784335 SHA-1: c32ea94e5b40b970e6a6c1396a7896254354e31a SHA-256: 4aed768f9adaed1f65f1bc5c2c51594e4fbc9a48e40d460710b1197db8524a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm designed to redirect users to malicious sites, specifically mentioning a lure for 'download iso windows 10 crack'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=download+iso+windows+10+crack
    • http://djapm.com/userfiles/file/vogumaz.pdf
    • http://podiummoda.ru/userfiles/file/3522797834.pdf
    • https://miraclechuppahs.com/userfiles/file/97228337126.pdf
    • https://www.confirmedtour.com/files/kazesejiziwevuzojobubizav.pdf
    • http://veewood.com/file_media/file_image/file/89589475978.pdf
    • http://chukguwang.com/files/fckeditor/file/29564724386.pdf
    • https://dollarplus98.com/images/upload/files/wafowobi.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/96132504578.pdf
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/95187170621.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614675dae32e8---50040524013.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/veradibodiwufufonapi.pdf
    • http://enkepharma.com/upload/files/roxoluzakaxo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60fc8b74d---44888338133.pdf
    • http://qhchemicalsfeed.com/upload/files/392047287.pdf
    • https://vayamcs.com/content_files/files/sitajefejume.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/47925019262.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba2360c66---90304094257.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/sakuvemitavemexetenonok.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/vuforadugimemibotuma.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/jemegipegezuxibaw.pdf
    • http://rrarental.org/upload/file/perelajiso.pdf
    • http://ngnjl.com/userfiles/files/32567284449.pdf
    • https://stiff.pl/ckfinder/userfiles/files/xisujimijudezexakini.pdf
    • http://ippinnudon.com/uploads/files/powumarile.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317901160db---4072377474.pdf
    • 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_off0000dd5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16792 bytes
font_01_sfnt_off0000f56f.bin
833e4f632e6243e9bb34d47e6122923146f8ad2ead95f5918929e09cca3a83d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16424 bytes
font_02_sfnt_off00011f97.bin
24e872c91847b78164aa6a63d494b117f167456662a6762fd234bafa6f2b6fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 10488 bytes