PDF malware analysis — malicious · 1d6ade7d3f5c1ddc

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 00:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 82e39b2bb748e121aa2a0442c10042a2 SHA-1: f6858fa7ceb4cd20d75cea15c0991a5ad4ce6578 SHA-256: 1d6ade7d3f5c1ddc2fb72df02593469a01075c3285739e7a7551be2cc32bef0c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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://crysiq.ru/uplcv?utm_term=lunula+only+on+thumbs PDF link annotation
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7acfe8d927c048c5a9b737ae440af818/66882641077.pdfIn PDF document text
- https://intellicapital.in/ckfinder/userfiles/files/nuvekuderadesiviz.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e30d2ef9c---16114490009.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eec9d1933---3921753541.pdfIn PDF document text
- http://studionegro.net/userfiles/files/zatiruzarawu.pdfIn PDF document text
- https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/filol.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/dasuwupotesujaw.pdfIn PDF document text
- https://klcmekatronik.com/ckfinder/userfiles/files/kafubu.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/82526171258.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ikkavuarfivd5n6eh4mvb71s7m/54252356948.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dc827bac91ab9f245400a423f2eb343c/juwibatal.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a805aa28f23---dukemazotinokeniwaw.pdfIn PDF document text
- http://sisparts.pl/zdjecia/fck/file/zajamebimuxowuxuwana.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vo20tjqbak1g91c51r35m11igj/30529988742.pdfIn PDF document text
- http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c8h6fs8m33qlpesj2v915npr7/fulurigalonutivafurerero.pdfIn PDF document text
- https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/dffa2be3c43ada6c1552634e7ee83f6c/51406877019.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c652a0b69a6---1293594941.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/siwibupeji.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087132431f12---78152741131.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40279279676.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee524624a6---6433517991.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995993594d---32489424290.pdfIn PDF document text
- http://rydelko.pl/userfiles/file/49877563319.pdfIn PDF document text
- http://k-yoga.org/file_upload/spaw_upload/file/20210523080151.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_off0000eb03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB03	17612 bytes
SHA-256: `c62fceb661eea06a0ade86d5b7d0532fdaaa144064f5f5e23087835b7216bfdf`
`font_01_sfnt_off000118e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118E2	10360 bytes
SHA-256: `2f8979e88448f68cc6dcddd4e9e0c6ef2349f94328cd19e7a6eef37483dd1496`
`font_02_sfnt_off00013028.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13028	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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