Malicious PDF — malware analysis report

Static analysis result for SHA-256 5563fcf07f52abd7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 05:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39e65f0ebfc1d8a5863edd9b4f5a7484 SHA-1: 382673765e0a3cab9735589843c0a86f989dc320 SHA-256: 5563fcf07f52abd71bb062a21b0570d2f3aae30edbfc515e325767cbe7539149
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=boxing+manny+pacquiao+mod+apk PDF link annotation
    • https://perfumes.dropship-tracking.com/userfiles/files/8194111662.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/19619388604.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959432e539---95979431353.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/80460787168.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/74057392721.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16136129519f76---11610124041.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/bofuzajepapodezuw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614121425df9a---sibivopuno.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/kenamujekipivodus.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/wukevemaref.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/45c6c9d3feef37172c4bb2dae754c203/xatifomu.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/nejanof.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/dujewibubokufo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c250c8e87---gaxumaxowewobemukujafi.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/67998950260.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6c22d0b820b483939ca553f0cc7609f5/92281113095.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/mibulire.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/daxeleragureve.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090221491083.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243ecd10c2---72854525780.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/62277888950.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_off0000b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16084 bytes
SHA-256: a4bbeadf728cb13361f2b1a6e2f00d4a3eba4db8bdf60b46912613b9428009a2
font_02_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 10920 bytes
SHA-256: a04e694a1b4f4994391ed9515271edfe1ab599fde04526246c242e35b08f45f1

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