Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faa5f0d33e4301c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 11:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20826108d0590887ed5c945a7966923c SHA-1: 4480dc11426434f5a8824f12a1a87affe43cdab9 SHA-256: 9faa5f0d33e4301c4667f48d680a6ec40989bcdeca7c092f444b3a11ab45db19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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=arl+aids+deezer+2021 PDF link annotation
    • https://85097781.com/upload/files/rojuletuzaxetosafoz.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/zarezoxogototole.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3de73451---fojufajimavakoxim.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/veluwekifeji.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lubejesedu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86da83bee15cbadfb0cbd93ffb6b92c5/newetudirupuna.pdfIn PDF document text
    • http://x-mobio.com/upload/files/35821709106.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/tumakomiruvisevuravof.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/33622084944.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210919102211.pdfIn PDF document text
    • https://digicpictures.com/downloads/liwuxesejozakexupefuz.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/fofid.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16143a66a96d4c---87396214225.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/98936735331.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///81635809540.pdfIn PDF document text
    • http://hanifeugur.com/image/files/fameba.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4d46effc77f5f943ea87fc9157a99941/kogowedagesopegase.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/wepasuzarus.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/66364868352.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/wurerufi.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/16004069664.pdfIn PDF document text
    • https://finliz.lt/i/File/tupixebotofed.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/zibuluguzurozaku.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463037a9d2e---mozotamara.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/6558976388.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10256 bytes
SHA-256: bcabb307c23febd4ba2691b856e8cf9d537fe672d52aa4025fa62d4a03ef8fa6
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 18828 bytes
SHA-256: 0e922705bfe02f0e037ae9e9fae0705adb1b998dbffa4bcf731537a040c8e7df
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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