Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e34111d4a54c6e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 12:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f64a71c9e5c5d1ebdec324fbf1c21ca3 SHA-1: 49451dd7f65541cee3c2e6b02b7489b530e080cf SHA-256: 90e34111d4a54c6ec355b2c45e2c2fd4e07ef0735ff045024be58f22c94ceeb5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mqip3hbi6q257b0n7pbn5ma281/toditufubojekalokaxomu.pdf In PDF document text
    • http://arsvet.ru/img/upload/lejuxikitizofozometuwo.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_205835_152.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/20366275468.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/65694001383.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nelaruwodofilevajir.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/18902673296.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/88384642840.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sorigofod.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe69b0c425---1389003798.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/42802559167.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/31465493911.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vk3mrk218e63kj9oqqitp1c02l/85227021562.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/gitizegexenusamiroladux.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/zinaj.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zapigodofugubuwobewi.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/9058636367.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/miberejisitowi.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/24661361210.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kesabokosavibig.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xukazatuxil.pdfIn PDF document text
    • http://xycrusher.com/d/files/jisabugibiwijame.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904130909_523459965.pdfIn PDF document text
    • http://med-os.com/user_upload/file/xolomezivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=azur+lane+gear+tierPDF 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_off0000b8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 10136 bytes
SHA-256: e5d5101f772956a7cdd64f33380a3ed3ca0eefaf466449c9b3193b4d6a4bde15
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 15628 bytes
SHA-256: 41893abf6bc5b8886e9f4cefbd068b34eef608424ced5adff55a6641dcfd9201
font_02_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.