Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed6b05d16d310d6…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 17:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fffe4e343d3113da05fd82d5619648f7 SHA-1: 4b08dd4a048a2e5c4e7100082c8a436a1a98aa98 SHA-256: 7ed6b05d16d310d6bd55eb9b7f4e6d437c2d2bc2f6af49d347769a7df42628ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to external resources, likely for further malicious activity or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://ecohort.com/userfiles/files/kumagorujutako.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0jirmsh620lrp4opsop3nj2dfd/19519425174.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/95666491374.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf31893aed---11915366898.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/lutuxixevusani.pdfIn PDF document text
    • http://geose.ru/userfiles/file/75459582086.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wotewiritasufigewokuje.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6ce5e61979fc8f250c462a923cea8a12/49183942118.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/81454cfc386d72c5ec74b370789910c4/vepolalugafivuzepezuno.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/35698009161.pdfIn PDF document text
    • https://campermagazine.tv/public/file/kajosewosonitener.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f66caafbf---23435691339.pdfIn PDF document text
    • http://mfahk.com/upload/files/doxipabulorebefesi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63c6a9d6efe36b3218d0be3535379374/revugelore.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/juxovibaderomowademuvo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/55592384558.pdfIn PDF document text
    • http://linker-apps.com/files/80648663377.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/takodalubigili.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46963019112.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/62758351944.pdfIn PDF document text
    • http://honda-vo.com/upload/file/69242836125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=command+and+conquer+generals+zero+hour+cheatsPDF 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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 17948 bytes
SHA-256: 83f506639c0cd444c8ace28a5e9a5545ca15e9ce5e993980b8e7b0ec9bef6fa2
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 11060 bytes
SHA-256: 80eb828cd238b4580970fd4b5749e5add6f480fba4bfdd0ee9a2c86b855f008f

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