PDF malware analysis — malicious · 776560983000ee5d

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 02:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f975b4ef023290ba94a7c68477ba70a7 SHA-1: 6654c111f64f1c07897f154dbb927a8b23e55a24 SHA-256: 776560983000ee5d4101097e90152d2ca2f4ebd2bb4673d901d262514b1b34a4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites and disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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 http://ahcxdq.com/uploads/file/070403448571.pdf In PDF document text
- http://lamachine.nl/userfiles/file/87193207349.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///sixotexaza.pdfIn PDF document text
- http://szyuangang.com/UserFiles/file///88470420023.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e3eea45f---kepabewekidizuvetokaz.pdfIn PDF document text
- https://congtydaihai.com/upload/files/32307753035.pdfIn PDF document text
- http://alfavs.eu/userfiles/file/8801346415.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1b06e8c4---dusizowuvedul.pdfIn PDF document text
- http://rkmaster.ru/uploads/files/88324218778.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35f20f23446c457e6518712f49f52b3a/65341864210.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1c0b1850---3072380033.pdfIn PDF document text
- http://princeworldwide.com/multimedia/userfiles/file/42377486942.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d6e0d1a7b2a264c63b5191dfe82038a0/zimetuforevuzusisar.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/klc272njkg8epnras32m0n63tp/4737616089.pdfIn PDF document text
- http://blackivy.pl/userfiles/file/minapenuxikuzuxudofexol.pdfIn PDF document text
- http://geostudio.eu/userfiles/files/sidexedipavop.pdfIn PDF document text
- http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96252405494.pdfIn PDF document text
- https://soportedevida.mx/ckfinder/userfiles/files/46156629779.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fc5839cad62d91b39703dd69f722bd1a/kujufifebefarerot.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ka70b82gsnsjt77be8cov4igks/rusefarox.pdfIn PDF document text
- http://bindashnews.com/userfiles/file/88138807650.pdfIn PDF document text
- https://imahima.xyz/js/ckfinder/userfiles/files/vazitadepulesewituroti.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902020541566942.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8992b420d18549b1c6f8a78ac462cfaa/zowemeligi.pdfIn PDF document text
- http://batiment-tunisie.com/userfiles/file/95122891283.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tantrika+kannada+diploma+pdf+downloadPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d207.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD207	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA19	19344 bytes
SHA-256: `c2ef09ded44c58c65c77c45caf02aa3f75b161f7f4575dd539ed404f40fde67d`
`font_02_sfnt_off00011c80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C80	10500 bytes
SHA-256: `365572090409916b878fda7f1182e90a42f4631aa08e821410c42aed8d3d161d`

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