PDF malware analysis — malicious · 93f68999f7f4c108

MALICIOUS

PDF

81.3 KB Created: 2021-07-06 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b9ba8dd5c0a648f844d7640fa7786ac4 SHA-1: e257f31d685749788e8d509f65a5b16330caf12c SHA-256: 93f68999f7f4c108c4e004d65daaa13c6520aeab3320145004397e1e437d8582

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The file also includes numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing campaign designed to distribute malware or harvest credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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://ketchas.ru/uplcv?utm_term=read+demon+slayer+for+free PDF link annotation
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/62989130cbc22e4ede6e64efbfe8da21/74124544465.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/fe367c5474e9cc0f8873184b65868363/2460063730.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad820558ad3---98382413217.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e296673e---benewapene.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609566cc73784---83484099370.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/46044756347.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vr7iropqps5jjmgpihb7q1a4lt/lonowotifigirokufukajexa.pdfIn PDF document text
- http://mywayrtk.info/userfiles/file/zemumidekorezeduteb.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160798f9867487---suborarad.pdfIn PDF document text
- http://thaide.org/userfiles/file/32940417238.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/208045733daa12a255db5e1b6a1b7aa6/2948034547.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4506b14437---76827600978.pdfIn PDF document text
- http://epoch-making.jp/js/upload/files/nunapofejamufa.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a316049b05b---23794181812.pdfIn PDF document text
- http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likivuraf.pdfIn PDF document text
- http://vds-construct.pl/userfiles/file/457277388.pdfIn PDF document text
- http://shophouse.info/images/files/1767200483.pdfIn PDF document text
- http://aquatherm-graz.at/files/4500605200.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e66a038f96d607a4a89f425a9a64f633/pinuzovukijesej.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4f4b031e---fubibofufipor.pdfIn PDF document text
- http://dajuicebarus.com/uploads/files/fubudupumurexumoz.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e870c1a6be66f94d52b56779ed53fb00/gozigewabefetemujexomuxep.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078c26d40c8a---tawubegetotobozi.pdfIn PDF document text
- https://cochleartudaskozpont.hufiles/sefitikijatimoriwujujo.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d15c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD15C	16148 bytes
SHA-256: `d6e9072ad220b35e3b4d4bd5102eb84b25fcaaf4d32827109ef937862ad18a94`
`font_01_sfnt_off0000fb06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB06	10484 bytes
SHA-256: `56cef81654f4b78816f3d93fd91fa302317229c6455dfdf3c77492b68f382ae3`
`font_02_sfnt_off000112d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012ae5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AE5	2464 bytes
SHA-256: `cfd15d66d9f898d74d6647a227608bf93a07aecb9783198ff7ad6f283d6a2ff0`

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