PDF malware analysis — malicious · f9f677efdbf05d13

MALICIOUS

PDF

78.4 KB Created: 2021-10-06 23:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: d2c3e06ccdaca40ee6f9020147874b84 SHA-1: f92317a182db256e949685214548f6eef71e1896 SHA-256: f9f677efdbf05d135eba24ce8fd31fa6eba5486459b60cce6073fd763ad8af5a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://pistant.ru/uplcv?utm_term=breadth+first+vs+depth+first PDF link annotation
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1615da4aae920b---5859447788.pdfIn PDF document text
- http://asclyziarskyklub.sk/userfiles/file/zuzizaz.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/843342f43118e3d6cd2dedfbd34ab250/55550804212.pdfIn PDF document text
- http://bftt.marketsearching.com/upload/files/88862129812.pdfIn PDF document text
- http://corkpotters.com/images/tafivibanosow.pdfIn PDF document text
- https://soccerauquebec.com/userfiles/file/26217915486.pdfIn PDF document text
- http://tageedesign.com/ssmpt/documents/file/nasexurekaditoxo.pdfIn PDF document text
- https://partnyor.az/userfiles/file/4277073483.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144396b29272---36359900417.pdfIn PDF document text
- https://capitalsyndic.com/userfiles/file/fenubulalesupi.pdfIn PDF document text
- http://villabrown.it/userfiles/files/wuvujexurileneb.pdfIn PDF document text
- http://associatedreclaimed.reclaimedoils.com/userfiles/files/32102226262.pdfIn PDF document text
- http://nagakuratrading.com/js/upload/files/bematusumuja.pdfIn PDF document text
- http://avon-bratislava.sk/files/files/lipulederutafaj.pdfIn PDF document text
- http://studiomarcheluzzo.it/userfiles/files/girizukakalepija.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/dawawiwapisugikilalimezeg.pdfIn PDF document text
- http://halongbaycruises.org/upload/files/nebiviwuw.pdfIn PDF document text
- http://salt17.com/userfiles/files/rezezorotovugoxesufureg.pdfIn PDF document text
- http://hawaiisushi.iorderfoods.com/uploads/files/zenoworinarajumusuxus.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472413f98f---42541805801.pdfIn PDF document text
- https://paeonia.ch/userfiles/files/83369429264.pdfIn PDF document text
- http://toflight.mobi/attachment/ckeditor/files/da3efb3db348282d2a2856aa05b9116d.pdfIn PDF document text
- https://chambredhotes-savoie.com/ckfinder/userfiles/files/76037963501.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/nupumupuginivomaxobowuvej.pdfIn PDF document text
- https://www.confirmedtour.com/files/97209413506.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_off0000cdc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDC9	10444 bytes
SHA-256: `7a83e82441d2285ed05098446ec257f38d0271b3feba667e8cf3e484e0af2cc5`
`font_01_sfnt_off0000e5a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A2	17752 bytes
SHA-256: `04f85f91ca15790fac213b3928e12698468dde31e54c651259f67fe71afef327`
`font_02_sfnt_off00011418.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11418	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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