PDF malware analysis — malicious · 5e56b9fbb6c669b7

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 18:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 548e2b0f17b0eafad40254ddc14a5c1d SHA-1: 0fefc509f9f720826f4456c8d521d468505315ef SHA-256: 5e56b9fbb6c669b754fbf9a9e9119f00bd591c692fd08891faaa2eef017aaf43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8060329e008826321d8b2157395cc651/toxavewotuf.pdf In PDF document text
- https://inprovitvenezuela.com/ckfinder/userfiles/files/fazekopebedagisigis.pdfIn PDF document text
- http://chinalabware.es/d/files/ruperafeso.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb08e5752---kilixigejaduned.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855722a0dac---7445241195.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/aslfkhp7edufckg76su2nmt45d/vunuxinodoxavoteponexon.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/50580574621.pdfIn PDF document text
- http://stonebreaker.at/90980023293.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19468bda08---85565346374.pdfIn PDF document text
- http://digifast.cz/userfiles/1992093119.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160999ea63961d---9543749315.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d998bf98e---35045543472.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161182f091055b---wawaruvidugukod.pdfIn PDF document text
- http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87621083274.pdfIn PDF document text
- http://gabinetortodontyczny.eu/userfiles/file/rokipajibelujidolimijoti.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b62e066e317---kavojojaposujudegosalire.pdfIn PDF document text
- https://bangvetthuong.com/luutru/files/12342782306.pdfIn PDF document text
- http://oryginalnedekoracje.pl/userfiles/file/10605479253.pdfIn PDF document text
- http://vizesblokk.hu/files/file/jubigoloxewasusego.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f125b7ff9674ad17f59ff0097ae17068/baxufedokilaxew.pdfIn PDF document text
- https://livbiopharma.com/userfiles/file/nepegudugawiketowazito.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8381764a---15110926081.pdfIn PDF document text
- https://greffedecheveux.center/upload/ckfinder/files/jugifuzufogipapit.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1edcbe79---pubuwiniwa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=input+output+subsystem+in+computer+architecture+pdfPDF link annotation
- 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_off0000da56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA56	19164 bytes
SHA-256: `ef0315d9a5b62b851079f88957b60d189b7a9be65e789038e4672e18888fe552`
`font_01_sfnt_off00010b8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B8F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123A6	11144 bytes
SHA-256: `4e8de8a70bc49ee7ebdcf7be24f40db4292aca34bb090a0b8807e5b993f897e6`

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