PDF malware analysis — malicious · 23feda0919f71c46

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 07:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: e29d275d4e730f1e5cd950cce67127b2 SHA-1: 1a7864e56f33f5c5df5e4b46253d1045beaa07c1 SHA-256: 23feda0919f71c46cfcb5ff00579951b7162558ab0a118c94e4d23f7bbd27588

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://cructi.ru/uplcv?utm_term=prime+minister+youth+business+loan+scheme PDF link annotation
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/323dadefb2ee4d9f1688eb3c80932eb6/32648787867.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2103f7b5559e37612acf6f7039cacb64/73965735309.pdfIn PDF document text
- http://thuephotocopytaihanoi.com/upload/files/jogiwirez.pdfIn PDF document text
- http://pressvaluation.net/userfiles/file/9433983716.pdfIn PDF document text
- https://kipass.fr/userfiles/file/86841810870.pdfIn PDF document text
- http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/22037906488.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073869306d74---65633067951.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r64ct7ssn5co663ovp8ci8vci1/xokuji.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b597d09047b---xapuwefimokufakosimasi.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/buzogegafumoviredosudir.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce16ae588c---1861609850.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e821307c---99472437414.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a185250fe---61473289981.pdfIn PDF document text
- https://sonarmusic.hu/up_image/file/60346167691.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f28319858---fekiwogutex.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93d9712429---94368181465.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b365373582dd12375680cd5ec7b21028/sawexifipazaminasupif.pdfIn PDF document text
- http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f765c111d1---84485974498.pdfIn PDF document text
- http://libron.pl/fckupload/assets/file/waragulimuxenotaled.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad923d3dee6---70220970843.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160badf9a93425---mepaxalobini.pdfIn PDF document text
- https://zanhotel.ro/beficientconsultingFiles/file/49254800560.pdfIn PDF document text
- http://bclgrouptt.com/userfiles/file/kibib.pdfIn PDF document text
- http://fixafilm.se/userfiles/file/80541099330.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/19990ac997da6a48c18e9cfad8d2750e/wenerax.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e26e9a859---1450922468.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609556893f1b0---37201255139.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_off0000fffb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFFB	16604 bytes
SHA-256: `845de4513f6ef98fcfc8d5fae0afaa741d86583b8789e7ec60e7b11747696e4e`
`font_01_sfnt_off00012b49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B49	10852 bytes
SHA-256: `d29146894b49b5fcb5d08e13406096ed65964ebaa6643edac6325af887b80787`
`font_02_sfnt_off00014433.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14433	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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