PDF malware analysis — malicious · 09b575a3059bd672

MALICIOUS

PDF

96.0 KB Created: 2021-07-04 22:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 6b9d2651dc15cece68fa5cd9074e0658 SHA-1: 778465331e31521b978d08c61a3953e9b0d85fcb SHA-256: 09b575a3059bd672dc9dddcec4838b8afde9dc61bd7a21332516a7d0de2d4a2d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

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://makiriaszto.hu/ckfinder/userfiles/files/98426500058.pdf In PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eec205e33---bafelanovipabitejisa.pdfIn PDF document text
- https://aldwalia.com/userfiles/files/81764198096.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa1dcb4bb---fagavute.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160806dfe23502---33072505060.pdfIn PDF document text
- http://cariboohose.com/userfiles/file/82993572979.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082657a76092---savologa.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/40d42d672b0afcc446930c31c00b8fe5/9475873627.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a3843ab83554c6018b645351ecb47588/zitokudekemajiw.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/1925473082.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff57ea83b0---2479646093.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/tobejubizijotel.pdfIn PDF document text
- https://deltagroup.bg/uploads/file/7730660000.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1363a57de310d8c291f25a970c9c0f4f/5988148042.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qb22gmbkuvabasr95optmlr3on/sekikururi.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6959ed16---wosofadabuxurojava.pdfIn PDF document text
- http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pivajoli.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63f862cbd799a3757bd653b0aad01e73/renizotatefetitu.pdfIn PDF document text
- http://belst.by/upload/file/54426907678.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093faf722c1a---5510585240.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cc82fdb1567bec5a008de40e15001bcc/1474933878.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719406ce09d---13430763614.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1eub0tlk3cj9u59i9vvrj878bp/13207172286.pdfIn PDF document text
- http://marketherballize.com/ckfinder/userfiles/files/donador.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=state+bank+interview+questions+and+answers+pdfPDF 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_off000111ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111EA	17636 bytes
SHA-256: `8724ccb360c1efcb800f56cad37487dc8e520148340e3219e4b7518b754ed217`
`font_01_sfnt_off00014072.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14072	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015889.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15889	11152 bytes
SHA-256: `a85173e33a6fcedc57114964f18bc2a08b68d42ae5164f20b0249f6f3a59166e`

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