PDF malware analysis — malicious · 4499c9c37394c0c9

MALICIOUS

PDF

69.9 KB Created: 2021-09-04 05:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0aa2397edf780a961ab22e4334bf7d24 SHA-1: f396be8b5e564f784873b778ae0a17acbf4e8801 SHA-256: 4499c9c37394c0c9d301aa7a39f7541b8f9e248309fb71bf5f42ae07484c57da

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly indicates a phishing or malware distribution scheme. The primary attack vector is likely Spearphishing Attachment, with the embedded JavaScript facilitating further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://hoya-system.com/uploads/files/202108181113101124.pdf In PDF document text
- https://clearpatth.com/userfiles/file/fujokadejopo.pdfIn PDF document text
- https://strechybenesov.cz/content/69690037446.pdfIn PDF document text
- https://songhong.info/userfiles/file/wosenun.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/64350353875.pdfIn PDF document text
- https://jkmart.net/FCKFiles/File/21552393866.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/41d8e54c8fae10673f1fcd94a2bd3324/3786027658.pdfIn PDF document text
- http://khocabien.com/uploads/files/27335706046.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7bnd9ebth9m4ecstklob1ub98g/33041088283.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9507b9687---wemonejumopadevofaj.pdfIn PDF document text
- http://epoxidice.ro/mm/file/piboxixuvedogeki.pdfIn PDF document text
- http://simonkuehner.de/gfx/userfiles/files/wukopodetidamutetejajodo.pdfIn PDF document text
- http://serting.eu/userfiles/files/72401570307.pdfIn PDF document text
- http://magic-mugs-factory.com/uploadfile/files/kifovanixawi.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085403b729d8---supuv.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/jpv0oc015afrev8gj330qs4jb6/vigapenitekenel.pdfIn PDF document text
- https://its-bulgaria.bg/files/file/retesawewik.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ab986a630fbed361410171dd7297055a/tusotixefemivibapopiwofog.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/38a978295b732ea5b71b580a0676f347/vubog.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa05175e22---dojakosiwisorolonowatule.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/59711cf4e1d15ba4bd1a703c9c6797ec/52712825747.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8b64ac41831b0cb49ccb000b1451ce6d/32345315834.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fc777b3hlgarqliqn83mm2op6c/jixededelemugos.pdfIn PDF document text
- http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/magifipaxuwijonopuriviboz.pdfIn PDF document text
- http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/daneteb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mapa+fisico+espa%C3%B1a+para+rellenar+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b3b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3B6	14488 bytes
SHA-256: `82914846ec881fb89833afd3ebebe0a390650147e9a9a86ce0d8dfca970dd9b3`
`font_01_sfnt_off0000d759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD759	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ef70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF70	10716 bytes
SHA-256: `41013803ea0e797870e8bda7c49daf7d3aacfafef44fb0ef9afb5071412ad6bc`

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