PDF malware analysis — malicious · 78ccb5f037fbd7ee

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 22:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 61d5bf11d654ce53ed17484857e0f9b6 SHA-1: a24585c103ea72f32b63da8930cb3156178c2c28 SHA-256: 78ccb5f037fbd7eea132228d70a1fd20b5f0c9db386d9f6dfa6d8c9d674f40d3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination by using disposable hosting and UTM parameters, likely to trick users into downloading fake software or documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=google+pdf+viewer+app+apk+download PDF link annotation
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/r9pr8977ksp7c2kh66o6dnrqap/nizifituvatobujina.pdfIn PDF document text
- https://deltagroup.bg/uploads/file/13343084592.pdfIn PDF document text
- https://glbtrader.com/userfiles/file/luwafalat.pdfIn PDF document text
- http://www.emailposte.com/pictures/notujowupizugiki.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22bf959d2---juzadutenifegopakeven.pdfIn PDF document text
- http://beastyenergy.com/userfiles/file/jibuxawari.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe690b8ddd---gutanusopibesapivijopov.pdfIn PDF document text
- http://autowagon.it/userfiles/files/4294993476.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16116fc9a953df---biroxiraraxojubo.pdfIn PDF document text
- http://doctour.hu/uploads/ckfinder/userfiles/files/3756318415.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16129d70e92095---69040035638.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbeb7ef58---64772876283.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/vben3knuermbqi9iork60ii7se/25649509787.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608824f73a17c---74381517222.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732e1cb183c---foruzigarokavebive.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dda52985eeb2b2d3621557f0f40c3cd9/80171426082.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160873cc915db0---manix.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd56c5f0c---tivenolonegeduregib.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/592d1d41215889ce264bb0b918f2c99c/19154111331.pdfIn PDF document text
- http://tndgdemo2.com/ckfinder/userfiles/files/53581016238.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a37db8e845---sijogizixididiw.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6ded3f65---32909500343.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bcb14c52---basizopufupi.pdfIn PDF document text
- http://it-hair.com/userfiles/kegij.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf9fbed23---3300216083.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_off0000bce1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d4f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4F8	10688 bytes
SHA-256: `85aad0b0cb089a3a172681919643da33b8ae6ceba469ce3cf105de205c2ca3f6`
`font_02_sfnt_off0000ed6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED6E	15592 bytes
SHA-256: `35319633a08998a1a066f97e731bc8e53f8f5338db18487fc24a32424c36628a`

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