PDF malware analysis — malicious · 52e753d0aed09cf0

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 13:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 2a238dda110380e1fec65e438a3cc8c0 SHA-1: 6cfeb61395acffe6a69308bb4e9ab219008a6c12 SHA-256: 52e753d0aed09cf0cb6efec50af2661d476bd81fd4218b43d80aef32eae39cf5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack pattern.

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://vandolderskb.com/images/usr/faguwuduseg.pdf In PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oquosg3bf6or6hu7vml68tsnj6/61854817125.pdfIn PDF document text
- https://rajaunited.com/contents//files/wibazexeko.pdfIn PDF document text
- http://domholidays.com/userfiles/file/tuzetewakujegem.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3auhjibiv0neggp5r1ai43krh9/6099363812.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ad59a4217d75dbb4d4fde305e8db24d5/sepakatogo.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/03ec9fab3bc314f8d810fc0fefb139d1/wupunoraxivununej.pdfIn PDF document text
- http://vtaky.sk/media/file/besonejodepesuditozaja.pdfIn PDF document text
- https://accu-split.com/userfiles/files/sewagitalewasora.pdfIn PDF document text
- http://iwishop.hu/file/6357916166.pdfIn PDF document text
- http://market-oborudovanie.ru/upload/file/pesisugudibapokox.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/900672b3a651ab242dfe03769ce905bc/40392096388.pdfIn PDF document text
- https://fibaquitaine.fr/cebatrama/userfiles/files/gelazetotoruwezelipelawa.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7d127ebc127b4324d7064994e4c3eddc/95279478275.pdfIn PDF document text
- https://zebcom.in/userfiles/file/nepikufo.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9br25t36ks1iimf8sfl780aci9/25470018007.pdfIn PDF document text
- https://terlickodds.cz/www/www/fckphotos/file/62722546841.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085dac00fe53---nepojapuzuzububokekafiwek.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7508c9ec5b9f56aabd4ec8a587c1c43/9439286829.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/75ab592f6b1eecd3b48547cd5dc6cf4a/wefobev.pdfIn PDF document text
- https://genegurumiraclehealer.comuserfiles/file/30803978539.pdfIn PDF document text
- http://www.bash.cl/media/file/viwonidimubo.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fcfbbae7---voxobasevabifulekugurit.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7ab9de7b153b82a254eccf8927eb64a3/42675293735.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=maximum+loan+on+property+valuePDF 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_off0000e8c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8C0	17472 bytes
SHA-256: `d708b35f4b0b9ddeb3f106210763f3e60dcc10f711e4440e43bff9b1e7fabb6b`
`font_01_sfnt_off00011675.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11675	10620 bytes
SHA-256: `1d2f34cf725a362e92dfdcb6abda0ce6ee6f11e134ae1758e08c6e01cb1c52cb`
`font_02_sfnt_off00012ec1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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