PDF malware analysis — malicious · d44a9e880046199e

MALICIOUS

PDF

80.4 KB Created: 2021-07-03 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 5499f3bbe8069421a53e5f5005a5ea80 SHA-1: c7273a6eb0ae28b3f72e7392a5e21c78b0e48408 SHA-256: d44a9e880046199ed32f2a841e16b66d133a8fdcc25ec46de06caa3d14a36586

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into taking action, likely by clicking on one of the numerous embedded links. These links point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself likely contains the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9764

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 http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59db1bc29d---42166022521.pdf In PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qut4059e6hd59ou3o6vbenhphg/lokujazovexirovarewoti.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/05650b37ca1f79385b27fdb3a7c24baf/midajopoteligidore.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a498e8e4ac5bf3508a9f7c65726069ef/2627618601.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7a6343c8---56341547392.pdfIn PDF document text
- http://clubesquilacoma.com/uploads/files/87608329652.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160924d50c13f1---5780264834.pdfIn PDF document text
- http://logo4you.dk/userfiles/file/7142251003.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/4917249210.pdfIn PDF document text
- http://pokemom2.com/uploads/files/58031663920.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160870a0840307---kobunakokifebozo.pdfIn PDF document text
- http://graficaeformazione.it/userfiles/file/23350894171.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28f29aa77---sexaruxujaxadapitamezosaj.pdfIn PDF document text
- http://www.physedu.in/newsite/userfiles/files/57279067126.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6etch78liljvmlk8isihkv272j/debemarevosobebejuwa.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/faedd3b2ca8eef9d08023c85dfc0b977/juxudoruxu.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/99996794974.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/60194750854.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7952b1ea02---60707352856.pdfIn PDF document text
- https://butchercurnow.com/img/shop//contents/vonejugakusuwepemimenej.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98d5a8313---zedawazipadewuzej.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30112178ca---zexego.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mcpqdnhrnci95s5rmd1eu4p491/77277702778.pdfIn PDF document text
- http://cnmrobotics.com/files/files/6324446699.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa658a421---35957492880.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbb839b38e---61350991529.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd03f5qcc8caq52pugkp5n9139/nipubuzedamukogopitabux.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+diameter+of+a+circle+is+twice+its+radiusPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c28a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC28A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000daa1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA1	10788 bytes
SHA-256: `d57ac979e3ef08fc71d245c2f0c53dbe44d991e2beecfa5b14990ebd2b2f9799`
`font_02_sfnt_off0000f38a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF38A	16312 bytes
SHA-256: `d04f67a9d4f4462e5246292cb29a117cc3d227e45a6b59ef1f9a1f4026830f9e`
`font_03_sfnt_off00011dcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DCC	16156 bytes
SHA-256: `15bdb3869d8d4458aad361551f68459b5691bbaf699be9bec01cb82de0a2cecd`

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