PDF malware analysis — malicious · 996d7cb2bd08218f

MALICIOUS

PDF

70.9 KB Created: 2021-05-31 13:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: ca747ee2d09c583633d193490573c1db SHA-1: 4c5d8f64af0071a73b43c17b3a9ede6e0e0be01c SHA-256: 996d7cb2bd08218fb5a674ecccd1384447ebdfdaf59d0d5f5e9f110093a76496

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Phet natural selection worksheet answers', likely intended to trick users into clicking the embedded malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9609

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://cructi.ru/uplcv?utm_term=phet+natural+selection+worksheet+answers PDF link annotation
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c176f1746fd5a91613fa1885bbfb905c/gagijefakatubiba.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608272a3f3cb2---vujebugotanox.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c673700fc8---16238682181.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6dd7c5cb---xuxakufifipokexixususoz.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/43409055219.pdfIn PDF document text
- http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dukazeliseremegetumaruwug.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8e954e8af25bb9ff4b46f5e5a99bce0e/45877374879.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f79b47c7---xidajutuwulasetobeb.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca357b41c5---53805037062.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725d2b8d2bf---57709683038.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4ace684608e1768b5be30d9ce4c5a090/fedevom.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c88adbe9a---17189172547.pdfIn PDF document text
- http://eortak.com/img/fck_temp/file/ropunudapajepenaporamunu.pdfIn PDF document text
- https://abofahed.com/userfiles/file/sonekun.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca5ac42c9---40169399299.pdfIn PDF document text
- https://blugarden.eu/file/likefidopenuwotuwik.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5C5	4924 bytes
SHA-256: `108a89dab1fa5f7a102dbe59d09405e7a571895dc73380a6226af480644c7c7f`
`font_01_sfnt_off0000e683.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE683	10072 bytes
SHA-256: `d45aa34a1decf66d224f4668ebe7fdfb0726c70fdc9b2c457ca2ff3e642ad853`
`font_02_sfnt_off00010908.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10908	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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