PDF malware analysis — malicious · c420f257dcae4627

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 21:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d8714be23dd68697c5efb526e933ab5f SHA-1: 0ab32633c4b0b9dcef128bb25dd091f0c83aec8a SHA-256: c420f257dcae46274f5b97c93c963a93fa51405e92c51d5b8fe6b06981c25ebd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm for malicious redirection. The document body is heavily obfuscated, but the presence of numerous links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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 http://musorcentrum.hu/files/article/file/vakefurukogu.pdf In PDF document text
- http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kuzamev.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/dph7vfthes116au1kb5leg07u4/95185395373.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c0430179---58466504051.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/96446148875.pdfIn PDF document text
- http://ascensionchina.com/userfiles/file/16899302625.pdfIn PDF document text
- http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/62511216783.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d86c67d8b---13607523731.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fcd2296d348b11e259cad6689e3a6ce5/witawapotejezotebekarasin.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/wubutavadasefipajon.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/97795554426.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a705e7cd66---diretizidoluvepoxupu.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e6ec52a37bb78ed2f4d4e35c80134a2/fiwametibapagafikozal.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9211e367d---nibomuniwamopag.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094afd7a4dd6---90051701580.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/is71mvsk1f87gdlm16di7gn8f2/57425943056.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/30a9c9a2d5f7bf283ab677d3e43df1a9/37749537073.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/kajer.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0a279fd10fc52c0d7943e3392c65e24e/50572722164.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/27555304553.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ea3b9010---37456454763.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6c31112f19c12fc3d56d6bf27a3610b3/waketerudebugunirufebuga.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84273ff59---85432073548.pdfIn PDF document text
- https://chpcentre.com/files/file/fikuxatileninesagageguf.pdfIn PDF document text
- https://x-software.cz/data/file/36854386821.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/gawonuritux.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=swami+and+friends+book+review+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f182.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF182	17160 bytes
SHA-256: `3ebe8c617ea3eceacbe7f274b952bce56caf383f6fe16f3e2b21b49d23e1b5d1`
`font_01_sfnt_off00011e1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E1B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001362c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1362C	17080 bytes
SHA-256: `a405a5c8e90e670bfbcb4a6432a10e9cf40b983d1df727f5dae54c6dc4a725f4`
`font_03_sfnt_off00014e14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E14	10976 bytes
SHA-256: `1868bf1cd8fb95ec9509e723acc8ed61507f64e934e4b2442b0b965aed13f806`

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