PDF malware analysis — malicious · 763a64345e2e1899

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 00:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 66098315c76f6c5284c2dd90d6a3ff45 SHA-1: d05294fa71cda9ed6d20de0e0d5457283d574fcb SHA-256: 763a64345e2e18991f5c7c1916aea42d0e27c007d8937d10ba1c7cffed9811d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form upload plugins. These links appear to be part of a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/70mjkctjnaab095dmfb3dukv3n/lunose.pdf In PDF document text
- http://daindnc.com/fckeditor/userfiles/file/fenojagubar.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4639420d11---20180835155.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79819a8b0---xowaz.pdfIn PDF document text
- http://hitecds.com/userfiles/file/75511507093.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/155cb83e41f274f9a7eee40279aa892b/50530623349.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160857594b6445---tevuvuvalasurop.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e19acf21---85518359054.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29c1c9f30---96853509242.pdfIn PDF document text
- http://afgventuregroup.com/cfiles/file/3503352817.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sli1522md8bo64ovcgfbd4t304/rezakizedes.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0fe9b296bdad7553dede0eebe75f162f/vafanokirafugaxikemor.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jb6e9qo3m5na7h679oe630jki9/5185946829.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e319f28547---87374325875.pdfIn PDF document text
- https://cecprint.com/images/file/retos.pdfIn PDF document text
- http://dorrstrechy.cz/UserFiles/File/ravomogiwezoxofobuxoli.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c442d601f22---vukozelekebijaw.pdfIn PDF document text
- http://nanobubblevietnam.com/uploads/userfiles/file/kujogaroxunazorip.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8707df96---78815900579.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/412bfd0206370a3bc67c5566f1ef22ed/xopenuseru.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/53051b4aed77dc73113c0ac0715c639a/mosuxemonejafatara.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8fadc0946120fc850dc3a578924ccd30/bagazexitunupapodewuvax.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ko07j22565s8j04hh7pg9k6bv1/43632038825.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/900c8bf04db76925c9136f451136c781/witemuvubozanader.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///16912068431.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/86418493889.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ratio+of+bleach+and+developerPDF 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_off0000f873.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF873	17740 bytes
SHA-256: `3f0e011a8f22782c7fae545ac79d7cad6364324d84d888e7c31ac52ee2486d38`
`font_01_sfnt_off000126ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013f05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F05	10800 bytes
SHA-256: `67996e81bdafe57c9d29d510bc250a5854eaf46f45b8e4ce4c3c07ee9eb6c328`

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