Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d905b06b447866…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 14:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b882a02ba799db8c93588fe847bcf46 SHA-1: ca47b8fecfb00ecead9ff84a15a3975018ce3197 SHA-256: 84d905b06b44786644d82ab18cb17dcb6592dac48300075aeed9b296ecf3bbe2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a business email compromise (BEC) or phishing attempt. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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
  • 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://ijp2.com/contents/files/dukixupugepo.pdf In PDF document text
    • http://meghdoothsuzuki.com/uploads/fuwux.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/dukeriken.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142d5281e86a---64634821731.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/80944249048.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/26228896999.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/pesezasajabumenu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a5ef6da7381ae57ae437cae22c9812df/59838655293.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fuzoranamorebabe.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/mefefafifesu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/kemodo.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58735650155.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/22903359784.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/guluweselesomite.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/2137373439.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394eed84cae---tafotagomo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/21236613488.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/63383612292.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/foramodanivunag.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/9025248131.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/79916449656.pdfIn PDF document text
    • http://roocenter.ru/upload/file/34000308730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+copy+contacts+from+one+phone+to+anotherPDF 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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10892 bytes
SHA-256: b36e53187bf4599b3630a505790b4dd317a96597284a915b677549f97c846264
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 17856 bytes
SHA-256: 50e82b879fb1d0f79006519893b8e7e36c40673ea9f6c280ba574be1597859fb
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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