PDF malware analysis — malicious · a9bcb5afda17aa95

MALICIOUS

PDF

78.1 KB Created: 2021-10-10 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: d71d6a4e34010a73d50983af9952c108 SHA-1: 9acec8d951751aa15b8990dcd5d14cd5ba3308e3 SHA-256: a9bcb5afda17aa950624ed02746d800e9a5f8b9cc8907edccf2d2f47b67f3e38

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The presence of external URI links and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.8831

Heuristics 5

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
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://smidgel.ru/uplcv?utm_term=codes+for+free+robux+2021 PDF link annotation
- http://www.sunriseacademy.in/ckfinder/userfiles/files/gopekenuxikanez.pdfIn PDF document text
- http://sushistoryus.com/uploads/files/nirib.pdfIn PDF document text
- http://ozanatalan.com/iboard/includes/userfiles/files/4798324187.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a8efc29acae748cdae5fdc2338a54353/82808277560.pdfIn PDF document text
- http://adhunikjewellers.com/ckfinder/userfiles/files/12586036586.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5b2d97a100c2414412931b95dede538c/pejidukubinerolo.pdfIn PDF document text
- http://etenindex.nl/images/uploads/dekifagobijolesom.pdfIn PDF document text
- http://fc-junajted.com/upload/datoteke/fibopavatadol.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/83780811089.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/72888874481.pdfIn PDF document text
- https://procogs.com/FCKeditor/file/dowijagoba.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/kunizovitaro.pdfIn PDF document text
- http://uralinteh.com/uploads/files/zibemagavomisurotujelibuw.pdfIn PDF document text
- http://catwalkexotique.com/userfiles/65109939361.pdfIn PDF document text
- http://art-ball.net/files/file/zajafisivoviwa.pdfIn PDF document text
- http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/xarirosizapewuli.pdfIn PDF document text
- http://pokemom2.com/uploads/files/36147965204.pdfIn PDF document text
- https://h016s5or78-du3.com/contents/files/pexulexitanuxizedetugagom.pdfIn PDF document text
- https://zevkotodoseme.com/upload/ckfinder/files/81809151756.pdfIn PDF document text
- http://picassogift.com/Uploadfiles/files/57781737015.pdfIn PDF document text
- http://duocthientam.com/uploads/ckfinder/files/zabinotuvelererep.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f1e1a9f46---61845583154.pdfIn 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_off0000da0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA0D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF224	10512 bytes
SHA-256: `80462cc91280fe4b296e17143231a5639fc23567c79b85e86d7e6c9582290d14`
`font_02_sfnt_off00010a41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A41	20152 bytes
SHA-256: `4b67cea00c3824956fed6af9908212cf8f48efbb74141ff718c4ee5e73476785`

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