PDF malware analysis — malicious · 6d0b3128a88b4c27

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 03:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 8eb6507e134bb57915ab74e9d8877427 SHA-1: 4cc36087b72dcbe824ff71bc0fc043a96eb2d781 SHA-256: 6d0b3128a88b4c27363bea967847bf194a2e1a782dc031328a4bbfe67cc9753b

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting and compromised WordPress sites. The embedded JavaScript stream suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites. The overall structure indicates an attempt to obscure the final malicious destination through multiple redirects.

Machine Learning

Nyx PDF Classifier suspicious score 0.4749

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.
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
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://cructi.ru/uplcv?utm_term=netbeans+java+desktop+application+tutorial+pdf PDF link annotation
- http://mynigaoe.com/upload/file/20210515220147.pdfIn PDF document text
- http://belgium-ex.com/images/blog//file/87439625679.pdfIn PDF document text
- http://oasishs.com/uploads/files/20210807_010635.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/wawalisiwasogovemibopum.pdfIn PDF document text
- http://dj-venci.com/uploads/pages/files/tidonupinoredofalazo.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f930752a15b35cb2bac3bd60edb8c8b0/bujotetenugulowu.pdfIn PDF document text
- http://jun-travel.com/userfiles/file/40545712670.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/87370780627.pdfIn PDF document text
- http://rebeccaosborne.com/uploads/jofawozuv.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/38079406586.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd56da80e---ligozazogaruj.pdfIn PDF document text
- http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210809203439077170mmefh6.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c9ab821d8---duwutetetez.pdfIn PDF document text
- http://villabrown.it/userfiles/files/55036344748.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lq3lcdjdh6qr2vdlk1fuvs9qeo/bisoteposilusikabi.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/93922136942.pdfIn PDF document text
- http://bindashnews.com/userfiles/file/kekufe.pdfIn PDF document text
- http://filtrydokoparek.pl/img/all/41176918693.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/21348434790.pdfIn PDF document text
- http://casaalu.com/luutru/files/fudojadoradixiro.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/userfiles/file/36219413693.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/vowuvoson.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/vewebexisedok.pdfIn PDF document text
- https://resulgame.com/calisma2/files/uploads/nafevezeraxixepisiveti.pdfIn 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_off0000eb02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB02	18776 bytes
SHA-256: `ab7fa5e85ce35e7c86162202512d25d22e90a7883511c433d1298d023ebf0f36`
`font_01_sfnt_off00011cbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CBB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000134d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134D2	11116 bytes
SHA-256: `d2ef67a4a9a7b5e18147598d4ff35807de72b7c73332cdd597afedfb51ccdad0`

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