PDF malware analysis — malicious · 27af35e60c343731

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 20:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 62a43a5ab3bbacdf7a127c36aef59738 SHA-1: 4610598f6afcdd41c802d569a086961ed33c7d99 SHA-256: 27af35e60c343731b5334331d95596bf62b06925edc8687755d25d287dce0763

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user trust.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=find+the+number+of+divisors+of+21600 PDF link annotation
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f77921ee805---xegimefosolajag.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2827551bf---997629338.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13810148965f4d4ed978506084c253f7/87096224157.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e2a1385a---wusumexezowasiwe.pdfIn PDF document text
- http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/1364073276.pdfIn PDF document text
- https://himanshikitchen.info/viking1/uploads/files/74753154253.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906ba0b5376---difupaxar.pdfIn PDF document text
- http://climacom.eu/userfiles/files/28913347672.pdfIn PDF document text
- http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/1072501019.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecdfd891b4---xewatu.pdfIn PDF document text
- http://icsbc.ru/fuploader/file/rixigazekexevimet.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/dawawawalovebavebizuzok.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acbde84a49699e9c3fc3aeba0f8ab45b/22920568923.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qcbj5qgomi0e3mvjen3pq260kg/juvugokikasub.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/33df6bae1b6bde924871558906f2adec/wiworodogufodobalev.pdfIn PDF document text
- http://amoy-art.com/Upload/file/jodupapajumifejibi.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ad5ba158---25654316400.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084eabc58931---givowegedikab.pdfIn PDF document text
- https://solener.info/ckfinder/userfiles/files/mekubizakivuj.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f19361b---23870827805.pdfIn PDF document text
- https://mmszke.hu/files/file/mumovufojapowi.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fa491c3e35478218fed879c76791b430/3899165375.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f1f56a75ea156d73638939b5f3d85598/vivekav.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5a5ccfcb---xibafunipolubafefazog.pdfIn PDF document text
- http://kaithompson.com/userfiles/file/12813502022.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_off0000c909.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC909	11156 bytes
SHA-256: `30be086c06641da8339212f12be1615a30fd26da5fe6fc8be25380188b6f78fd`
`font_01_sfnt_off0000e2ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2ED	19592 bytes
SHA-256: `14ab5e6214157169876f62ff7fbf4e7e01f554192e1bffe014d15ff0a5774384`
`font_02_sfnt_off00011685.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11685	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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