PDF malware analysis — malicious · 958982f3f6825597

MALICIOUS

PDF

80.4 KB Created: 2021-08-26 12:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5eebfbdd7e96c8c54a7dd8318f03c6fa SHA-1: cf0aaf43fe150b905416cd8a294ebee2b59ce068 SHA-256: 958982f3f68255970a525b8ed457dd3296a36dd05104ea9142edb27a6e11c686

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use SEO manipulation tactics, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. While no scripts were directly extracted, the nature of the links and the overall structure point towards a phishing or downloader attack, likely leveraging embedded JavaScript for execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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=new+gk+gs+question+and+answer PDF link annotation
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f47d66a3---tizorikoxonomapokefizi.pdfIn PDF document text
- https://www.myosiaffiliate.com/199trust/img/file/1672626842.pdfIn PDF document text
- http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/fejineger.pdfIn PDF document text
- http://iwaandccareunion.com/clients/57137/File/70792365925.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e047b00c35---javuzigowebota.pdfIn PDF document text
- http://donateagift.eu/userfiles/file/30166671435.pdfIn PDF document text
- https://indirimlipin.com/calisma2/files/uploads/watabekagebozuruvedidudut.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/384639bce5ae8a648bb171cd4da85142/zinufuratoku.pdfIn PDF document text
- http://paroissedementon.fr/upload/files/14203891417.pdfIn PDF document text
- http://criminisiepartners.it/userfiles/files/sobegakodetikekimeri.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/meniradapufatuwurag.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a4460886---1574268738.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/416f8d8076b05156dfc61e03c791e6fd/butopudasukibetivapoku.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/856a8a69b3f0c77c8c5f5bd84cc5f573/56134678825.pdfIn PDF document text
- http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/67217564419.pdfIn PDF document text
- http://bulmarconsult.com/files/81501767945.pdfIn PDF document text
- https://phoenixturkey.com/upload/ckfinder/files/3994099148.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a23290ad43a---dimipomedub.pdfIn PDF document text
- https://hostsolutions.ro/app/webroot/files/userfiles/files/kujutefofixasazifumad.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31a0ac5cc---pilanif.pdfIn PDF document text
- http://rts-3.ru/upload/files/24181816077.pdfIn PDF document text
- http://cbafjvn.com/uploads/userfiles/file/91573497692.pdfIn PDF document text
- http://zoldjogsi.hu/uploads/files/2559563385.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d86383f5---sotevoti.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_off0000d535.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD535	16840 bytes
SHA-256: `a8dd94295a1930ee07de1fe42bc180e452485107d83b158f38e81f7267669ac6`
`font_01_sfnt_off000100e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000118fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118FE	10776 bytes
SHA-256: `64e8d45ab1ba2600d1b6bcce86cad96635cc6c17001d5e2d3ab579b57c59427d`

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