Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29f880caa8164a7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 04:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b7c61b9ce0be97704844ed393b1d879 SHA-1: b80062b129b981dea6badc53efa5449abfe78f3f SHA-256: e29f880caa8164a7a6db546d966cafce63fd28797bca5dbbc4853412e77f71e2
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of a QR code lure and visual download buttons, combined with urgency language, indicates a phishing attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=qr+barcode+scanner+iphone PDF link annotation
    • https://mintedimages.com/ckfinder/userfiles/files/23334674795.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c5cf2eb1---zobifufagujewi.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/55520775013.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/16874394879.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/52569951727.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/pagesutoxazomazenuduv.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/25912320801.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b97bc93fd881b9501f127cafc38acdd5/fizewumimoxavosis.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/foxonowevoxenazewavumixu.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///99717488415.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/25266333205.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wutixivugadizereg.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54a0642b1---53787644087.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lediresomowi.pdfIn PDF document text
    • http://yoron.net/up/files/35584305531.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/sowakalaloliro.pdfIn PDF document text
    • https://arendic.cl/files/53717209056.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/27584942506.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/65148193945.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e5dce82082091fe03faf390c88df109f/togugoba.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10664 bytes
SHA-256: 2c02926e3df2ae171911ac1a5c6da2a21b106b84579798d710284ba9d7d4f023
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 18496 bytes
SHA-256: 6aa900b51c43c128acc53cf2ed8629ee103e2a000bc1a86c80fe1ac83f25d7d6

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