PDF malware analysis — malicious · 04b08df977e9af50

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 08:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e5481fca083dd76c59aab9940c1f1c94 SHA-1: 98eb15eae4ded95cc5a36dc27f9b98d9dc3b81f7 SHA-256: 04b08df977e9af50d60faae9306eb7b82388637e9793e60627caf4226706b2f9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly identify the link farm nature of the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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.
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=crossy+road+similar+games PDF link annotation
- https://yenicekentkaplicasi.com/userfiles/file/96288626064.pdfIn PDF document text
- http://greenhere.cn/upload/ckimg/files/202109032003013203.pdfIn PDF document text
- https://maymac.info/userfiles/file/lazejafotukemi.pdfIn PDF document text
- http://hani-bee.com/userfiles/files/kedonusodamulugigu.pdfIn PDF document text
- http://heydarbaba.org/resimler/files/dinizejejikojaguwuwinajo.pdfIn PDF document text
- http://whuntex.ru/userfiles/file/29979140473.pdfIn PDF document text
- https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/38153738818.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134324610c1e---81239822926.pdfIn PDF document text
- http://www.agot.pl/upload/file/tijezesonaka.pdfIn PDF document text
- http://a-aqua.fr/ressource/site-image/files/14421207717.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb6a6811accbbaf9a5bad2364d1732b4/16220204754.pdfIn PDF document text
- https://smshealthcareservices.com/ckfinder/userfiles/files/xufabarekikozumilegi.pdfIn PDF document text
- http://grandviewgroupresort.com/upload/files/96471694464.pdfIn PDF document text
- http://dealershop.es/camarasegovia/userfiles/file/85824010046.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd7a8f766---55386533261.pdfIn PDF document text
- http://gyn-ordi.at/myPix/file/51777223073.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efc6f502cd5b3c3ddf68dd906244471c/83251348580.pdfIn PDF document text
- http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/62010357455.pdfIn PDF document text
- https://parisnordmedical.fr/docs/file/75917876204.pdfIn PDF document text
- http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3841570107.pdfIn PDF document text
- http://soeurs-scjboran.fr/soeurs/upload/files/30993218744.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lufeke.pdfIn PDF document text
- https://yuktogel.com/contents/files/buxefifelufi.pdfIn PDF document text
- http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/nizixozuwidaloj.pdfIn PDF document text
- https://paperland.bg/uploads/file/9216947638.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000df6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF6F	10536 bytes
SHA-256: `bae3599b9bc2e950c7d8c0dece1a6837990f32d9673301d78d587f4de7aef8be`
`font_01_sfnt_off0000f739.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF739	17620 bytes
SHA-256: `85c1f70cfc7a09ef3dbf350ae3a1d3186755025ebb23e8f418f23be79d168a95`
`font_02_sfnt_off000124f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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