PDF malware analysis — malicious · a386b53b08fa36f0

MALICIOUS

PDF

95.0 KB Created: 2021-06-27 16:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 48e9d359e292b94d180e80984598033c SHA-1: 37cd9c29fe81ec96024ec7071cb40586ebcacd25 SHA-256: a386b53b08fa36f0bf9f1ff0786e18e332f1b17d79c207dbf264362c7a201a28

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or SEO spam. The presence of external URI heuristics and the ML detection strongly support a phishing or malicious redirection attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cructi.ru/uplcv?utm_term=coin+master+pc+online PDF link annotation
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9397afd82f438ba7acfe54661ff27dd8/77529133661.pdfIn PDF document text
- https://kraftyz.in/ckfinder/userfiles/files/30613049391.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ab76921792647ddffd25b3e2ed1b2df/roles.pdfIn PDF document text
- https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4620oo6uagt6obn8mr2bj7usd3/68040331775.pdfIn PDF document text
- http://capmar.eu/userfiles/file/90519031953.pdfIn PDF document text
- https://babamore.com/upload/ckfinder_temp/files/20210531010335.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/87ed222a784fda53c96ee9ecd49e5938/monoxobu.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02e3a2812---firuxuv.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtc3kjeep0l9jtlk6e3fr3rtjm/39832881514.pdfIn PDF document text
- http://leebyunghun.org/new/upload/board/files/34689445651.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/17494704647.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b020c6d716f---66411384572.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f12187356---9338035718.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b263c1c12---xatofibasulupivudaf.pdfIn PDF document text
- https://vinadesigndanang.vn/uploads/image/files/9781316724.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c347ab69a3---37179051918.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/797364491f9dee5cfaccc643c7849021/99541344014.pdfIn PDF document text
- https://giustofiori.it/file/botekeso.pdfIn PDF document text
- https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/13ee0d3521f97af7c5dab2df50dc4c41/95659758398.pdfIn PDF document text
- https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8000d1a09---9583075148.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/26477593864.pdfIn PDF document text
- https://universal4shipping.net/userfiles/file/lifaxatizekoxu.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/30460241a7a4165fda0c99b0faf67f16/tutuwogupikituzelisegowe.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d511fa32---51789599801.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_off000110d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000128e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E3	16980 bytes
SHA-256: `e457c12d72d386ad4442d59752e8e606348dfe3ad430268c6a45b0f11c7fe48b`
`font_02_sfnt_off00015540.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15540	10564 bytes
SHA-256: `f8825768575ab3f261189caaad55a8ed2de6e1c2c44fa673ace75f6b51bda086`

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