Malicious PDF — malware analysis report

Static analysis result for SHA-256 72074584fbe77930…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25d352748c24b55fea6491e9e2df0dc0 SHA-1: 792ed5845639081fec1bb99214c6bfb04ce43d3f SHA-256: 72074584fbe779303ed3e5ceccf31b7c9a47290097fb70605774f2a7f01fe724
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. Several heuristics indicate the presence of a link farm and compromised CMS uploads, suggesting the PDF is designed to lure users to external malicious resources. The ClamAV detection and ML classifier further confirm its malicious nature.

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
  • 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 https://smidgel.ru/uplcv?utm_term=amazon+alexa+apk+for+android+tv PDF link annotation
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/7580588241.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lolajekube.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lokinoti.pdfIn PDF document text
    • http://na3.it/misc/file/dikelalagoralajupaxunik.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6e84206f---wedexagosemoretanufa.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9fh6paikjidqk4usc37bk7n0g3/zowumefebitadusol.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/xoralogarejoxitojas.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/livelofazudab.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6blha988vghup1biqns8vev653/36937738159.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66683082828.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915232454.pdfIn PDF document text
    • https://davaocarrental.com/images/file/fuvujefapejejasu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631168502.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/56699153444.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61720787386.pdfIn PDF document text
    • https://derfo.info/resimler/files/wumubigoviwarirelorina.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/wesuzutepebamebawara.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/xogewudinobazekire.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jowez.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/redidawojesovikuri.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/joruzutudidonevelivapu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/basuf.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/detujuzusunuxefezalewedi.pdfIn PDF document text
    • 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_off0000b918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB918 15128 bytes
SHA-256: 6efc711d9cc60a1f8e5c21193957416b907adbe3395524402befac6e1b98d1c0
font_01_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10792 bytes
SHA-256: eeb8b0b45fd41128b2d35a7ff0d456163f3103284ac12349e4dd08cdc21f5b59
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1