PDF malware analysis — malicious · 94a790e101f8aa7f

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 13:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3aca95ee2240009acad1edf65eb5881e SHA-1: cc72b3d9339739d8c5b73e2a7de7f0dc6f80da6c SHA-256: 94a790e101f8aa7f1bb33748fe908192f7f7bac46be48815b27f5e9d271cdd59

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS upload directories. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=dyson+v6+stick+vacuum+manual PDF link annotation
- http://euroear.eu/ckfinder/userfiles/files/13276081990.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834b0ccca51---fesodusibinuliwisewoxojis.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k616a9h885o3iis84r7sk87u0b/lovuwimisuwinetin.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22ca95481---8314632458.pdfIn PDF document text
- http://www.lnk-creation.fr/upload/file/sosawosavefarev.pdfIn PDF document text
- http://handbook.hu/upload/page/file/33796532073.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609861ffb27cc---63214793539.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/33559199753.pdfIn PDF document text
- https://uzmanwebci.com/calisma2/files/uploads/6680253017.pdfIn PDF document text
- http://accu-chek-event.com/ckupload/files/mumobe.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f3854e656---muvonejuxigipepagizilu.pdfIn PDF document text
- https://marljivo.hr/UserFiles/files/36420643108.pdfIn PDF document text
- http://alliusie.com/userfiles/file/vikubojilim.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfe6e981e---87426258878.pdfIn PDF document text
- https://iword.de/userfiles/file/55604187096.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/niwulofin.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086836e2ba2a---79640429012.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/bivetawufusonekewin.pdfIn PDF document text
- http://ahkjt.com/upfile/file/38567446462.pdfIn PDF document text
- https://www.aukuras.org/ckfinder/userfiles/files/73586285521.pdfIn PDF document text
- http://maybomchuachay24h.com/Images_upload/files/somivaxiniperuvu.pdfIn PDF document text
- https://groupburuemas1.com/contents//files/juxurusa.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/9086582903.pdfIn PDF document text
- http://worldofpacifiers.com/editor_uploads/system/files/86709097029.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_off0000e4f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4F6	17800 bytes
SHA-256: `b70543ffec6c9bab8044b851bdac3fa3042c6b79a66b185a3769b05fab37005b`
`font_01_sfnt_off000113b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113B9	10700 bytes
SHA-256: `658bf5bd61448d5ef14578cf988f967f3807e8265c40ef7aef758603e496083a`
`font_02_sfnt_off00012c59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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