PDF malware analysis — malicious · 91d8cd824c33fffa

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 18:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 29e1f63baafab1eaede8661abb995e2f SHA-1: dc7e87c8ee70a311e371e9f89e30479162758f65 SHA-256: 91d8cd824c33fffa330b4e3054aaf0de57cde69a8fa33581928e1facd0ad13cf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587e71948---febejin.pdf In PDF document text
- http://suriyedostlukdernegi.org/image/files/53259114213.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9702de68---vivepufijuxojuwaduradiw.pdfIn PDF document text
- http://myphamnanyno.com/luutru/files/jujabonabusukudeluzabog.pdfIn PDF document text
- http://sonsuadogo.org/Images_upload/files/woludaliregikivo.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e3380107---janavudilor.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/39171971368.pdfIn PDF document text
- http://mptech.vn/ckfinder/userfiles/files/xipegununu.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/35b922675fa58485504885ec044926c8/98782389690.pdfIn PDF document text
- http://vietdubai.com/userfiles/file/zogudodegejisunomilitez.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2be1d23196dd06ef32866f1713108c99/99562441228.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94a11be42---74363300671.pdfIn PDF document text
- http://ksklinika.ru/ckfinder/userfiles/files/4323901251.pdfIn PDF document text
- http://elijasprojekts.lv/files/file/43222900617.pdfIn PDF document text
- https://torgradio.ru/new/files/file/98265125434.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/c6dqn4uhj6ifuq63e4kp7kcl3m/gezezojatowirered.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dsp7112tnphtmq5rkh2vgj3k1p/37426286755.pdfIn PDF document text
- http://webinaris.biz/ckfinder/userfiles/publics/files/26836591582.pdfIn PDF document text
- http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/47235821202.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/851737890e2f5b6b54c72f2cf335ad58/fesawivudofibizodigofe.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zebalirazomarinogabizodid.pdfIn PDF document text
- http://asiadomainstore.com/userfiles/file/fufuvotud.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a16b44ab7351816fdc053d87f97bb50c/47211563602.pdfIn PDF document text
- http://hglobaltour.com/FileData/ckfinder/files/20210801_9D6AB8BED11D2BE3.pdfIn PDF document text
- http://daugiavanthienphuoc.com/media/ftp/file/gunewutiponaj.pdfIn PDF document text
- http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/robaromogu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+connect+my+sony+ht+ct290+soundbar+to+my+tvPDF 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_off0000e7cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7CC	11496 bytes
SHA-256: `28f83da7ae7eb7b0e775e0675dff8daf497e98f3a2c3c00f1b0c3b6bd5c2ad4e`
`font_01_sfnt_off000102e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011af5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AF5	17720 bytes
SHA-256: `34173b909986e3bf20185febec7a2a5fffccc1131a8b1f1bbf95424d315850b9`

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