Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd442499e47bb43b…

MALICIOUS

PDF

91.2 KB Created: 2021-11-03 08:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11a9674e8424a8db0fcddea7df0eac6f SHA-1: ed7ea1d4a149aaff4df6a5ac4e7525b55f5e0e21 SHA-256: fd442499e47bb43b8eb13428a6ea07baa1f4bee0d83ad65a9460caf99c90244a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various PDF files hosted on different domains. Some of these URLs are associated with compromised CMS uploads, suggesting a tactic to distribute malicious content through seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://klaipeda.cvzona.lt/resources/img/files/47906896851.pdf In PDF document text
    • http://infoegrafica.com/userfiles/files/jotegeburalepatoribulo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/84221598178.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202110file/2021102010292670554.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9b89e9ed6---javarisobelotopos.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/weluwusomi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616a95df9204e---94977711767.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1617c92ef9c399---bajatajegaj.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/kesomatedotegubesinotarun.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/luzuj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6d57899effd2495d93cc9c9eb9033d3a/togumota.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1634283011_d220a1bdad.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/55742713238.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/57118456602.pdfIn PDF document text
    • http://mienjoy.com/upload/pibexevoz.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/23801215533.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/26332560322.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ccd2d115905cc6df933a1745d402887c/16059698106.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617a0603e451a---54434708192.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/xuxubanadokugubakotow.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109230110574348.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/97059105421.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df28437ee---nogutid.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152059997bf0---riduzax.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nusavuduguweliror.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=transport+officer+interview+questions+and+answers+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_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 18744 bytes
SHA-256: 053304e23444d06a43bc11275cb1bb169eb199e7aa65534712ea0b9c0f197302
font_01_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 10928 bytes
SHA-256: f24eee37fcd006a29f1be4511c0c8212b6b830165d49de1aef1be76063187989
font_02_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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