PDF malware analysis — malicious · d91c69372782cd9c

MALICIOUS

PDF

76.5 KB Created: 2021-07-08 09:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ddccb70a0f93ece05a8ecb8f2f12624d SHA-1: db4cebfa5e4955af84c54b0568e5ba36003618cf SHA-256: d91c69372782cd9c46d5f61e0ca264cc2bb1baec7e6151eff1343ae357d9339a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick users into downloading further malware. The presence of numerous distinct hosts hosting PDF files indicates a broad phishing or spam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

Heuristics 6

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.
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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/7q77tbk057160sh9b6v90q1ubm/8353856215.pdf In PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e9887a70---73026423733.pdfIn PDF document text
- http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/jibagiv.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/zugemexumenef.pdfIn PDF document text
- https://ajitcoatings.com/uploads/52441214560.pdfIn PDF document text
- http://chuaphucluong.com/uploads/image/files/4647703699.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/t1d5r0va13f9c6ummv00h0fpdf/57892326288.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fefc182f---83583170213.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076616694734---luzarawe.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/garub.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ele74666l4i1r6bjkk53m37ci8/62644847677.pdfIn PDF document text
- http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/wugis.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/34363864627.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/735078a4a6758abc0758caa18404cd09/38245793793.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5193958d11964e35b4dec14f240b3919/10012272302.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb19c8acb---jewobosogiw.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d35ef4a63c4---513954802.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jvuihdro14676iub1v3urgeaf1/14475956629.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/tekag.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0808719c7---44463327839.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o0qekrn1bnrpbtdg3aiddt9bmr/92872578023.pdfIn PDF document text
- https://dineflon.com//files/savupameliviborudurazeg.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22c13df1e---6211705898.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e6dd347ca2d82410188bf6186c97f97/tibopususamuweduwe.pdfIn PDF document text
- http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/48683521304.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7723b958f4f79963c1ffe88f8ef2372e/wexovujadizapatamopamax.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079db3ac3cdd---4470351432.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+grove+dictionary+of+musicPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c881.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC881	11120 bytes
SHA-256: `01197e00dd5c2dbcb6d5bf417d9ffdf6952671c84cab45ba21974b8efedbd202`
`font_01_sfnt_off0000e21e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE21E	16384 bytes
SHA-256: `463d788910287f96767c06830dbffbd1666a460c2763d8e57f81c046b8c7b1c4`
`font_02_sfnt_off00010c61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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