Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109544e5fb2e876…

MALICIOUS

PDF

62.4 KB Created: 2021-09-25 14:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a1c710838d644a013864e54e0dcb900a SHA-1: ff7a926878b83f8d6c0715a97ba35e37c09dc09a SHA-256: 1109544e5fb2e876632c8ad1795cb7f0201ab45524657fa31aa7e77521b45468
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7246

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332f8a090ec---56409772920.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3bd0e31a7---23428154110.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/14171900509.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50852722718.pdfIn PDF document text
    • http://gaudi.tw/upload/file/tebopawe.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/dafaviwiwitimixutejo.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/7438770916.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/vibukerugapud.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/botuvisekawovuzojuk.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/kiximasoxinutosa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161403e7e7392c---10989956392.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/gofixebafujijavuxetiwa.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dojumokelapiseji.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/zevirosare.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/80602076101.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/papumadedivotodibe.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jikutimitiwiru.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e493875df---pafoduxetuba.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/diwazonimizibof.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xiwozonekarepaxesux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+games+sd+dataPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 18044 bytes
SHA-256: f31aff1970b64ca837c95cc55b022470c98743c98d6d0eb685daf2fc9c0f84b2
font_01_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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