Malicious PDF — malware analysis report

Static analysis result for SHA-256 469b1f756c560d56…

MALICIOUS

PDF

77.8 KB Created: 2021-08-11 03:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e258c3667620a34abcdb7fd1fe381512 SHA-1: 7af0b7d9fe5d10fe3f29bf76fec362e03b00ce2c SHA-256: 469b1f756c560d564f0769c464328896af59888541abb22bca4df69ece30466a
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://anhuifan.com/upload_fck/file/2021-7-8/20210708095206956186.pdf In PDF document text
    • http://homeopathyhongkong.org/files/ziwuw.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1c35835ff3f12f0933e0a6d24bcc5222/75905411604.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0cbd850f---62663697976.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a890617c33e4f8638655a21886668a5d/xaxubogizusabefuzofas.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/50601857187.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/sakusekowezalev.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb516ccaea---wisaxajepomitur.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044d622b0a5---sabibepefem.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/sj047cg7jm2e42hjh8g8vnmc7g/dikizem.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nedekewovozebelalodize.pdfIn PDF document text
    • https://2acontractor.it/images/file/38527102916.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/sazivorofesuferewizetu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab07cf88---76466350592.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bd27ce0d74e20733b61cc66b741c8048/famejiz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/31822211132.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/31878489408.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db20d06cb2c---25059406227.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4647a989c5400a4a4de552d3aeb2a24b/rukab.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/78291086999.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/14362431878.pdfIn PDF document text
    • http://azizolace.cz/images/file/68069801674.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/5081499290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+imperativo+espa%C3%B1ol+pdfPDF 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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 17696 bytes
SHA-256: 0312212ed48c2c4dadbe7eed3a676180cb5b55addff39af8eaf03392993603dc
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 11060 bytes
SHA-256: 79d51852a9af02f80c3bf43946db8c622336b0350d449593156af4626dd8852f

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