Malicious PDF — malware analysis report

Static analysis result for SHA-256 91980092193dac2e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 17:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c6319d61934a8e11bbcbf7d094eacf4 SHA-1: 8d429ff680b97d69368add44aacc93dbdeddf3f8 SHA-256: 91980092193dac2eae6d8467fffa9c37e7be20eaa900832034025508ec7c2646
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. Embedded JavaScript streams are also present, suggesting potential for further malicious actions like phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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
  • 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://synerhu.ru/uplcv?utm_term=app+gravar+tela+do+android PDF link annotation
    • https://vnjhanoi.com/upload/files/xedawen.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/44831530274.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/64043446096.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/sesunazolejemotax.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/86448376303.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jg8gmtisgts986mv2tgfovcl7f/43852395912.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/12506345942.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/papezavidatovigugexibo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614267a87eb76---57703648482.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/4469645859.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/nomokusoxebasisa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2fd96c4969bbefb0b139b72a8824b587/91415095712.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/fijamibiserulop.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/tusuf.pdfIn PDF document text
    • https://razredna-nastava.net/files/bulejoroxurezofixi.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/rixasipunerilebum.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/81751230117.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091010372873499.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8da73506---labudewi.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/27446416403.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/53243361489.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_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 10444 bytes
SHA-256: 2e769b13d3bb77416425438c5d0de8fc739edfe3ebc4e89dd52b356df40679f0
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 18620 bytes
SHA-256: d38e49bb42e89f3f7dc26dad96b3dac9570c89d9ebd7465b1630ceabebea41fb
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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