PDF malware analysis — malicious · d82329ffdb370a4a

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 07:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c065e35f0b58ee61b214d243ad26982d SHA-1: 7f69ebb37ef1a7863b45355e0ffab31e09028227 SHA-256: d82329ffdb370a4a8d0c04287e1e7be064fc42c2816797393724d209009571a8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/559cdddb7610e52ed3348c1b85740480/97243364628.pdf In PDF document text
- http://capesociety.ca/uploads/files/54652837017.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d479d3b3---nubotezatupa.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/30647894703.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bcf6f89d641019144748c20948d0b0b8/kawagusapodosomijebivawij.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c12464bb---89014905208.pdfIn PDF document text
- http://farmina.ru/uploads/files/paxizuxudar.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/78e94380da7dd2c92b0d9725982449a7/dorifawalegenozorebonesex.pdfIn PDF document text
- https://tskrea.com/userfiles/file/77570110634.pdfIn PDF document text
- http://webursitet.org/Files/file/73311500547.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dpdq84s0g8l9jjr31s2kuiu68d/gutitodusepejotifunugana.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e474b648d6---32631143388.pdfIn PDF document text
- https://ssekolkata.com/ckfinder/userfiles/files/53910319048.pdfIn PDF document text
- https://subarini.ro/mm/file/xozekesema.pdfIn PDF document text
- http://tichdiem.surecare.vn/uploads/userfiles/file/86508821131.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/dixegenolufasemek.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/86fbf3461f3b3fad5eb86e10e806e2b2/41213237474.pdfIn PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9jf3np6lrnirkgvf4oe0ht1rm5/39386486337.pdfIn PDF document text
- http://daimarconstrucciones.com/images/admin/file/zoropodekixuposi.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/de301e0a61e5687f281dacc8e5d259fc/gexowipifosuwa.pdfIn PDF document text
- http://www.asap-recruitment.net/upload/file/42602048949.pdfIn PDF document text
- http://centronegozi.com/public/badon.pdfIn PDF document text
- http://tochuchoinghi.org/files/jolinavopa.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f2976faa---mujikunugularadifalerafi.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c12b0c8d9---745544229.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=trasplante+renal+pdf+revista+nefrologiaPDF link annotation
- https://doi.org/10.2In 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_off0000d658.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD658	18868 bytes
SHA-256: `f9494a01394efec21191bb9904d7447b253deb35c78049b5ce6e7c1f6b2e5282`
`font_01_sfnt_off0001078e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1078E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011fa5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FA5	10700 bytes
SHA-256: `6019693e1a07499fc36a2d2f22f95bc14f2dedece42eb59785c872eb3b8ebab5`

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