PDF malware analysis — malicious · b6985f831fec83b0

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 09:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 693952aa3ff12424187b7caacb8aed0d SHA-1: 9219af532b366c7e588840e0e81c35b5b377b121 SHA-256: b6985f831fec83b06a665ef912f6b4a2ac1e2805571da805d8c6add5fc2aff11

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=ready+player+one+full+movie PDF link annotation
- http://wintec-samu.hu/uploads/files/vesetebixil.pdfIn PDF document text
- http://izeninfo.net/admin/upload/files/toliwimimitedumebapip.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5a6a1c02cbe28273528e70e3ac96aefb/9379022038.pdfIn PDF document text
- https://larrialdiak.es/files/galeria/files/xotoninatolomule.pdfIn PDF document text
- http://pulsarvn.com/media/ftp/file/nakejoririwagupodajuw.pdfIn PDF document text
- http://kuppersbusch.hu/userfiles/files/xuxikasapadusugozi.pdfIn PDF document text
- http://miyisz.com/mingyi/images/userfiles/file/jisuku.pdfIn PDF document text
- http://tetraeng.it/userfiles/files/dodujuroxoli.pdfIn PDF document text
- https://xcheck.vn/uploads/userfiles/file/kuxowefibajelo.pdfIn PDF document text
- http://slsnn.ru/content/files/famoziduwafu.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9ca9b0911dd08c805a1870b77cbb58e1/3182789659.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2b917c62974753d50a9c7d6ebb98fe13/42765631391.pdfIn PDF document text
- https://austarpharma.austarchina.com/upload/files/nuvunemuwibupi.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4be67e36---zerikoraxavobibevugig.pdfIn PDF document text
- https://open-call.fr/uploaded/files/75515434036.pdfIn PDF document text
- http://hanasushipickup.com/uploads/files/32711202853.pdfIn PDF document text
- http://roletyhanarol.pl/files/file/23276459454.pdfIn PDF document text
- https://smwebtechnology.com/arishayurveda.com/userfiles/file/vejogadurifos.pdfIn PDF document text
- http://lawngo.net/fckfiles/sutafimuroberowatopoxe.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/579b3722adcb04a5bf759c1dc82e0050/84595880071.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eddcc404---34496578154.pdfIn PDF document text
- http://pwmtqatar.net/userfiles/file/29362846563.pdfIn PDF document text
- http://agavietnam.com/img/files/zabowolelodekuzo.pdfIn PDF document text
- http://phfamilyrestaurant.com/uploads/files/rifilosulixamam.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/vunit.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_off0000ba96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA96	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d2a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2A8	17004 bytes
SHA-256: `70ed9ac2d77ef996334b8e1593bee67a2aa5603595de5a79122d6883994c1c36`
`font_02_sfnt_off0000fe7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE7B	10716 bytes
SHA-256: `c4d962cf6201ac65ddd533fc307ffe75bff1d8cdfbfc56011fd488c448841b88`

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