PDF malware analysis — malicious · cd98fc514ff31a61

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 14:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 3b3eff0cb6beb7634c32073778ee54fd SHA-1: 2d31549d20a4929ab43e41f8550a6a6ac0982e02 SHA-256: cd98fc514ff31a618c86da38181236f40e30e5bc13a10966773046a81735c41b

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and PDF heuristics strongly indicate malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely to distribute further malware or conduct phishing. The presence of urgency lures suggests an attempt to prompt immediate user interaction with these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://coretry.ru/uplcv?utm_term=cash+budget+exam+questions+and+answers+pdf PDF link annotation
- http://softtox.com/new/userfiles/file/fazoxikipugowin.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ea451dd7185c4a3800c778e08f7ee5ee/weteregemupu.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/92dc3e79e567f3acf4e15b79e584c3ad/wudawosazef.pdfIn PDF document text
- http://xmzhj.com/UserFiles/file/98983603116.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053e2563699---govagalidipozinabagubapad.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/24151834032.pdfIn PDF document text
- http://123podkrovie.sk/editor_uploads/files/27471917924.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/nitojowefivonuvugokux.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160798b88e2609---fagisopo.pdfIn PDF document text
- http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
- https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/45718374474.pdfIn PDF document text
- http://theleadershipworks.com/PO2/UPFILE/userfiles/files/wemelibipakab.pdfIn PDF document text
- http://ekolojikweb.net/upld/userfiles/file/wasenixobapukagizap.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d70a9fbe---jexomusoviwo.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70bf17f0e6---razutalozubudibogene.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f177f156f1---fowuxelep.pdfIn PDF document text
- https://www.sacict.or.th/ckfinder/userfiles/files/rifusagurejuzame.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f908d07606c7e192b62d7cadf1526ec3/98327512398.pdfIn PDF document text
- http://otelm4b.ru/admin/ckfinder/userfiles/files/fodedigejewifavaluf.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/39cf2c20b60154b158c9047fe6725177/vebevetokilijigawug.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a9fa5fc1d368a267bdec69a204b2442f/22951411458.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/402f821837f076989362ad622977e34d/29405856393.pdfIn PDF document text
- http://anandamsanyal.com/userfiles/file/35808444711.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e01b77f06---96238372580.pdfIn PDF document text
- https://tekartltd.com/upload/files/zinebiwofazo.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/57308970093.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.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_off0000f545.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF545	18416 bytes
SHA-256: `2012474afceda6ab1e6418a716f8621bebce6ff484a6554f4e4a820d7009613d`
`font_01_sfnt_off00012514.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12514	11504 bytes
SHA-256: `d626d81ac3a7d1a37ce962d40952f479c466885e40b3244e0a29a14f25600f76`
`font_02_sfnt_off00013f7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F7C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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