Malicious PDF — malware analysis report

Static analysis result for SHA-256 09aa9c99150b778e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 03:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb0a48f3698065c78aaaff1d5d0306d4 SHA-1: 09510f037aac4be9773912261503b484e4b16697 SHA-256: 09aa9c99150b778e689cf11f49d10621b193a516de5b1a9c5627bf4fbbd4fe65
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to compromised websites, indicating an attempt to deliver a malicious payload. The presence of heuristics related to password-protected archives and link farms strongly suggests a phishing or social engineering attack. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 10

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3648250bc---tajujova.pdf In PDF document text
    • https://duvanco.be/docs/files/ditevep.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/nutixudamofofu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/tokuzujixafawobapuzolej.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/tukojuf.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25131258070.pdfIn PDF document text
    • http://reylab.com/userfiles/file/10458201842.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gumipodemivutomapidid.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3b74c85---wavilokuzuni.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/nofewitanewid.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/vuvutupupofufajo.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/kosemokomavu.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/49189856466.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5b563a56684ebf6b3651a5d23102c23b/favekakewuwefekojelupe.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021325782.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/18553007573.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c184a9ba6---87490234257.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/757b9121749c90dd5907278b50ba360d/luwunisaluduza.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/39887468852.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/75736148155.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/46036620461.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/acd6ae6ae50483a136763c2a6b2546a4/xuzitexirivuxomojujaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wifi+password+no+root+apkPDF 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 10484 bytes
SHA-256: 3a39e104cd8c238caa45ffb1dbba9b529db7ca7ec84929b55a445b0544748c4b
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 17296 bytes
SHA-256: fbbe001241bd579b387c2bcb2c812c6a5e9a384afa65d324019521c8f2340fe5

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