Malicious PDF — malware analysis report

Static analysis result for SHA-256 9130638d128c3f39…

MALICIOUS

PDF

83.5 KB Created: 2021-08-26 10:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94a2d73bcc13813ba9fc20349a872213 SHA-1: 65f9fda2a3577e5168c861fdd45e3e3f1922a7f5 SHA-256: 9130638d128c3f39958032c448fa3796b0cef46a7bed2dcf7f0a745627bf10fb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the heuristics strongly indicate its purpose is to leverage these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://rooptex.com/uploads/zunifasuzerigagafovol.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/cccdsmok6elmgi119t3tc80p4h/xalabazijozidadigejuditu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9263bdcab0---46669130585.pdfIn PDF document text
    • http://normel.org/files/upload/file/97079046018.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/69294583253.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e479ee1ff975a554b25c8b698ed1586/nulawagorijopisagofinov.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/lututama.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/wemokafubigogodojo.pdfIn PDF document text
    • https://chpcentre.com/files/file/84349802477.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71557339693.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1320cddd1---30346993929.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/ketibubupojo.pdfIn PDF document text
    • http://lovesenergy.com/file/10261496822.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/mamovuxumojipizunijuwigo.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/givedi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lotigevuwosukezuw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df34664ea---82339712078.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/15837731.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/95132402105.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608678c69228f---73987193728.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/50716111148.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8c4697c6---33583353411.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdfIn PDF document text
    • https://webhosting4.net/media/file/8767998787.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lanevab.pdfIn PDF document text
    • https://techlan.pl/files/file/27368948651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=developing+discipline+and+self+controlPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10864 bytes
SHA-256: e12054ad986ec5d5d8395146df71c147963066a540c957ff9caa5fbffc573f69
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 16796 bytes
SHA-256: 33bd566254475d5091396bf58f86d9b5ba49f552a17ea689e57aba83bb6a2191
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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