PDF malware analysis — malicious · 927bbd17e56aec14

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 17:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5d0d7661c1504317c054a96f62a0a631 SHA-1: a4611ab45ec54c9498b9ec50d39824c71f8748fd SHA-256: 927bbd17e56aec14c0716c2dc266ea1ce729bfce53c68e4d969a63a6abc0f492

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress sites, specifically utilizing upload directories within plugins like 'formcraft' and 'super-forms'. These links likely serve as lures to phishing pages or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=worksheets+of+nouns PDF link annotation
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8d5ce7ad---xofejidomejigotuzimo.pdfIn PDF document text
- http://littlepearlbooks.in/data/eimages/file/86649195848.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b0j19tsfc6jaq9nb9pi1rvrm1/duzuromimadiwarel.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a74953db9---99152212945.pdfIn PDF document text
- http://udemadriatic.com/userfiles/files/patifodusuzixotolejiborok.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/64bmtujm176r9g20kheu8nmtmq/xadar.pdfIn PDF document text
- http://qzgj.cn/upload/file/modulupu.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01811f4f2---1662337574.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/083fddf6c5d3a827fbd113e920f54108/riselotojorugorimukuguwo.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb7e0c63f921196019b2aee503de9a0/neguloxajiwiku.pdfIn PDF document text
- https://local-atlas.ru/userfiles/files/78529242100.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/77678025234.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3714a66127---95124198366.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d6534c96---71283284413.pdfIn PDF document text
- http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/66000421861.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c1c352f5---8355707700.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1ab0fa34---wojavobikeneximeje.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bb9qg0r1mhs99on5lm3d4j3o58/wiwutoseporapaxefuvixik.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456b006eb9---7972235063.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a75a316a844132b62b57f417b0cae1e6/jonowolesekekizexab.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0f24b64c101fcc92037a12a0eda80001/vanazarinekuzejeje.pdfIn PDF document text
- http://mousike.it/img_ins/files/61594004181.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9c86a85bb08edc79347325245dd6ace6/fubobeluliketiti.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160802ac97f0e7---luroxirigikagemetetanepem.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_off0000f4ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4AC	17556 bytes
SHA-256: `f7f2116740b3d31fa4b5c656aa422d0835306d545bec81df507f6513cf627b62`
`font_01_sfnt_off0001220b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1220B	10196 bytes
SHA-256: `9b3025165faf4ee051d5f0664075d64aff03c14ce1d15e2e03d3df79bce0ad8c`
`font_02_sfnt_off000138ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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