Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7e6b52943f075a…

MALICIOUS

PDF

87.6 KB Created: 2021-08-06 19:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f68a3dc1cfe538000c71aa2a5e5a966 SHA-1: 1d70de0d63991fafda5d49dc5fc9ae93ff249b87 SHA-256: dd7e6b52943f075ac4be930211c3e132ac096e96a33c81e19d5c10cb8cb371b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farms on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=stihl+028+super+carb+adjustment PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d50c5fsicln55lrb6ppjtbia5h/makozazufemelegexaw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c5213155b000fbb4a73205d80ee1a3a7/tipifevomejawip.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f5aca662165cde2fc4c04261433f66d/60009511789.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc4191b1d---16724357568.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/toxexoloniwek.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/xizinidutaxejovaxudolabox.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/mogerudivepa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84caed8f6d---webinuwafudemukadup.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f7b0df481b67f531f978628e18a2fdf1/buxakugesanezegibutarizo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b3621f3e---66688270639.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gobudelerisosevijuferop.pdfIn PDF document text
    • http://teplospectr.ru/images/files/36190369932.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160975b9998b76---zugex.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/bomorifelaluw.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e4c4cc2016db5432ea9ce52212d646a7/suboguwaleseloweti.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/29d64aa41d6cc662c6cb9157a57dc079/25350769650.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/81fb31d2419871ce9d1cebd99b0a7230/26575785753.pdfIn PDF document text
    • https://kueapem.com/contents//files/16354296221.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/73092479735.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zinunimegemoda.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b2b42f70052d13e0ebea1e295f32bb2c/88087649025.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f32c6de2c---suzov.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 17636 bytes
SHA-256: 24d29bd1f2cad40f2e6b3f4ce12455f10c4cae8119d41bb1a00752d2a2a0b741
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 11556 bytes
SHA-256: 2b7ee94f7d5f455925e7c38ee3196f8b0781aa377c8ec8079f8364be69836ea6

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