PDF malware analysis — malicious · 201aa951f754457e

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 00:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 8381a4f98a0e1af88506e739d88fc583 SHA-1: f7c0dde91813581ecfd53c70768080d9493f663d SHA-256: 201aa951f754457eb41af0493d2b46242bd3fa93ed416ec29531ea39ba826d78

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading payloads or revealing sensitive information.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=how+to+highlight+pdf+files PDF link annotation
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecs4rfqjm4uoc1ngsj9ta2o1d0/46512638870.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/da1e26742281655a3e8744da8e6ed840/47323952243.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b866f072c09---rizizepixekigugafet.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/niwepafenuxov.pdfIn PDF document text
- http://cappellastudio.it/userfiles/files/9611819873.pdfIn PDF document text
- https://hosrem.org.vn/ckfinder/userfiles/files/3003881544.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8efe9256---wozatininebuxeruji.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5861ad279f465cf17afe04f87d93de27/jetotagejufa.pdfIn PDF document text
- http://puzynowska-kancelaria.com/userfiles/file/40151015510.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125747377a4c---15329441163.pdfIn PDF document text
- https://www.naabelectric.com/userfiles/files/jiner.pdfIn PDF document text
- https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/61ae5a6931ea324f9751b6dae1009051/sejabaxugejilodimoxud.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ld9hp1eifs8cas3lplnq4hi848/tetimekunutufizefev.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ad01a50d---jarudi.pdfIn PDF document text
- http://bezpiecznamlodosc.org/files/file/sekomi.pdfIn PDF document text
- https://agencement-menuiserie-var.fr/stockages/files/gibawutiwugerepatapati.pdfIn PDF document text
- https://tanthuantelecom.com/upload/fck/file/17636840608.pdfIn PDF document text
- http://togul.org/sites/default/files/file/72264401684.pdfIn PDF document text
- http://hydrem.ru/images/file/3137444672.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/ferokinaladukalun.pdfIn PDF document text
- http://podushka.by/files/files/12987398960.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5e1b9e0b---pipel.pdfIn PDF document text
- http://sudeoksa.org/userfiles/file/20210823161001.pdfIn PDF document text
- http://citra.cl/userfiles/file/36096720141.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f06b79510545ffc6e4ed4f80092b7b05/22859387352.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_off0000c30c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC30C	16248 bytes
SHA-256: `a6c7cca2952d69d4ba97b640e5dab8976afe1a4674683df29466623146a6312e`
`font_01_sfnt_off0000ec12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10429	10488 bytes
SHA-256: `17052384ea002c9c7253fd245872d7884bc1e5e659667c254a61d8eea21214d7`

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