PDF malware analysis — malicious · ba22cdb8adadb4d0

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 00:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: bcd1087e7a60248fe42c1a8b2a1c33c2 SHA-1: a2fbaae056773c9c4612bc353a837cf9ab515651 SHA-256: ba22cdb8adadb4d0887fe2ca9de939de9ac4d3693c0b5e80f21c5a01bd9b44dc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm. Some of these URLs lead to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=nice+to+read+you PDF link annotation
- http://transsnabstroy.com/userfiles/file/62870978668.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/fufuwawosixuz.pdfIn PDF document text
- https://eyescare.vn/app/webroot/upload/ckfinder/files/95550955581.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dac3aad21d42622b38c334cf398612ea/negasovule.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1f2734d5---76213563567.pdfIn PDF document text
- http://bluekeydigital.com/images/pic/file/88914098338.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/43h1ir1a955k3j6ajb7m7ohmc5/zibaxalolafuleko.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca5e91c28---bakigokapidoli.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1109023ec---bagagobanenigegofuzoj.pdfIn PDF document text
- http://camwater.org/media/files/21778266144.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160702dd28aa74---kakarepowatozugimavo.pdfIn PDF document text
- http://ersatzmonitor.de/userfiles/file/80813109590.pdfIn PDF document text
- http://wasserburg.pl/userfiles/file/57275327572.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/files/60969312641.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf197573cf---bijewijewu.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6976b9df6ebe199fa69305945ed61308/lamoxajefu.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dfe3fff34df6daa085dbcdec037fa4e9/sinijazivagunot.pdfIn PDF document text
- http://bidmitt.com/img/files/file/33376546679.pdfIn PDF document text
- http://qytbearing.com/upfile/file/sijilo.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858b513f4b1---63921272612.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/87605aa28976c5fa3d93f0e47424dbd7/34529183120.pdfIn PDF document text
- http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/71898057189.pdfIn PDF document text
- http://lezeckastenakosice.sk/upload/files/gezuvilabuzatitawow.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f3be02684a1a3728f5bc4b93098e16a3/19144668473.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ac61e05c9121579c852d7c8913171e4c/77678835130.pdfIn PDF document text
- http://radissonhoteltraining.com/userfiles/file/nanodez.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_off0000f10a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF10A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010921.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10921	10236 bytes
SHA-256: `3f4d1ae3e1adb644991200e1dfccdecef0439508044ef61d553b23fbb5d7dbd8`
`font_02_sfnt_off00012046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12046	18480 bytes
SHA-256: `d3df8df9a8950f802263c29f87afc784c5a6254a0033570d619e530b6518fdd9`

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