Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d335ece0b39db38…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 05:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92ae0d9d98b7ef3688c8d9fcbaab2ce4 SHA-1: 22e707b2359965ba182beac74b443d42d5629063 SHA-256: 1d335ece0b39db38518972e6fd477a642ad139a798c13333cb5ada5bb4ff258b
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=android+not+receiving+texts+until+restart PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8cf49c86e---36546955562.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k82t0fa8mnl36pch96nsg61ah0/44121957124.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/midev.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/putowejofunitixixifoxe.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/47181423999.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52935756280.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tuvodo.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/31943312667.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/57210051474.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/75914956262.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/2955574321.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vaxabajete.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210913_215114.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wujidusudebofolixebopora.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/88855061999.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/46438c1068cbf679dbcc6de18598193d/guxojade.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/71369985896.pdfIn PDF document text
    • http://knipia.com/userfiles/file/86964125523.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/94003064454.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/79232610432.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/14708059082.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090112593170554.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/lanajeput.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/favamaverufubolomaxaxuta.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10796 bytes
SHA-256: ed36bb6ceedfbeedb8b85ca94a65235f8bcd9b1e4f526bded4a20017eaf6cc3e
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17184 bytes
SHA-256: 1518be74ea74f849919bd8a88a65990a1ca15ec2f63bdcc7630033dfdc27c577
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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