Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37589922eed890d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 07:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5aecfaa084be8d292ab087dd79121323 SHA-1: 16e02d2de93ebf55e979f40b093a9c3f155cc929 SHA-256: d37589922eed890d32f9e7e521c8ee51388ea8febcb88523e09c7c733b416833
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the intent to trick users into downloading harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • 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
  • 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://bahia-group.com/ckfinder/userfiles/files/79225961736.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6e5996668a2b602b6deb367edf566cb9/rokomevuxogilin.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2f76e766---mobonurekebadosumaxupegi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f880b6588f---74644424907.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/jebekowopopuda.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/49211536972.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/redugenogufupuxowuwe.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210903144834.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/jonazuzewujazawekume.pdfIn PDF document text
    • http://khocabien.com/uploads/files/xajiwifijuruzuv.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/bujukatojudi.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/luwejozawo.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bexutorujuwejesud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161465a58f104c---karasujejizezovosowutexif.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613368970438b---88227327233.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/wukegil.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143b24e64dcf---74333996415.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614181aa899f6---vuzupazafudel.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/79739647832.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/megeboluwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=condom+size+androidPDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 10356 bytes
SHA-256: 45988be510e798e6e43160ec359e714e76e898e9d0340ee8b41d51b7997163b6
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 20524 bytes
SHA-256: adaba252f8073485363efdfe7106298e65a070c6cf27437c0fda010b26bde59b
font_02_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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