Malicious PDF — malware analysis report

Static analysis result for SHA-256 f434de769a98f5af…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 02:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33db6e8175980cacc393792285ef6f6c SHA-1: 4abda5a20a93a72d13d6db139075beccb5828dd2 SHA-256: f434de769a98f5af43c9757d37eab28e1c63e7c5a3191747979b042c31f4a4f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://gitedu.in/ckfinder/userfiles/files/16481218093.pdf In PDF document text
    • https://euro-m.si/web/dokumenti/file/90887513393.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wunabalarudubitunoxuxap.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/kojirukegexibuxafegufo.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/kamuwidogas.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/9562964351.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/33177955068.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/68760916907.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/lunujojafow.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78823da6f---12566571742.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/suduvapi.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/zafovipokowedam.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/15621604581.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/dizutepeki.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630922764.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/tanumap.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/uegr1qsir0ouv2tvusab0dqfgd/82266230774.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/72851480094.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905041025.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/22644399615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=make+an+app+for+both+android+and+iosPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311307276540.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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16720 bytes
SHA-256: ae6023bc13bbfdb4011a8a27628855ff013e9738710e536f0f966cbce37d7e18
font_02_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10772 bytes
SHA-256: 19156f5718b7ec794a73ee7104410b42cfc397c1f319c49552c0026cc000343a