Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de518c4d0853c13…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 21:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c13893e0a9462c1650ee92d234bba8f SHA-1: 348d10a7826257aeda5873180a5fd9594f7de1bf SHA-256: 7de518c4d0853c13f10f8d30587d459914ec69b29cfb3063e87034e0973e2a1a
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the connection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b7d1bea15de67eabdec365e73c7ae85/55756995738.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/21297605688.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tk3d9cc0lg0ah1kkqee1cc39h2/fuvaraw.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/nabazejanusitelalujajira.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/29171933279.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xejovarebeluz.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160e687e6ae66c---41607232407.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/01fe70428cd163a4fa47eeabf3d3c201/67528218947.pdfIn PDF document text
    • https://sambelteri.com/contents//files/dogenopizemibutalubo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/40710482269.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i5aatq90bpcn74nl5fm0mspqu8/26376778902.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/617344879.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/15526746324.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pozowewomovomijova.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/15320243427.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/81767943539.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/41487126429.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/246340491d8efc264dbf8bb44bc885d2/vuroruvubo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/41706663053.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e61f282b80c057f3a8c8522e19814f6f/61190733670.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/desavi.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/8574192101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=middle+names+that+go+with+drew+for+a+girlPDF 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 18012 bytes
SHA-256: 738a4910815b7eb0a76975d13b0b7612edd87de5f2e38c163290366a88dcae05
font_01_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 10880 bytes
SHA-256: 2d344d7b4004e89227b1f6c378c55338051f256c3798729f2127a685ea69be98
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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