PDF malware analysis — malicious · 4ca689564a6e7f63

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 22:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 519e3033f2b864244bebbe01736b4523 SHA-1: d8f296a011ad5b9b59aaddeed3ddf9c9dc7a657e SHA-256: 4ca689564a6e7f6352b352b7855385dff72ae9eda3f60aa9d7bd8145ca11db5a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=australia+inland+taipan PDF link annotation
- http://havefuntogether.com/image/upload/File/10977226575.pdfIn PDF document text
- https://sarna-zapiekanki.pl/ckfinder/userfiles/files/39032396626.pdfIn PDF document text
- https://karapinler.com/calisma2/files/uploads/42776983537.pdfIn PDF document text
- https://centrorevisionimonregalese.it/file/96091215406.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fnkbk85lp0rhjkv54aq49m6qf2/toniselinifenafiluge.pdfIn PDF document text
- http://caphegiabao.com/upload/fck/file/42653038058.pdfIn PDF document text
- https://talaa-obour.com/webmisr/uploadwebmisr/file/bitalexutarakeduxuvafeteg.pdfIn PDF document text
- https://digiconelectronics.com/media/84501362677.pdfIn PDF document text
- http://rheumatology.institute/upload/content/file/77021324639.pdfIn PDF document text
- https://hoakhanh.vn/uploads/image/files/19196514518.pdfIn PDF document text
- https://cezartravel.hu/userfiles/file/52042638861.pdfIn PDF document text
- http://dongduong.net/Images_upload/files/85051968143.pdfIn PDF document text
- https://cgeminfos.ma/upload/file/lunatopijen.pdfIn PDF document text
- http://stoka-saarlouis.de/userfiles/file/xukozutilasageweruriminon.pdfIn PDF document text
- https://chambres-lannion.fr/userfiles/file/3029157475.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/25406612975.pdfIn PDF document text
- http://ogcdc.org/uploads/ck_upload/files/butenejugugenojor.pdfIn PDF document text
- http://kozelsk-adm.ru/files/uploads/files/winam.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e0819dd49700047e6e0b4f4727b1792a/8373060209.pdfIn PDF document text
- http://cheapmarkt.com/userfiles/file/tazuporafigigitu.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a489dec7---dadis.pdfIn PDF document text
- http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
- https://nocenzura.space/web/img/podborky/files/betipapepemegome.pdfIn PDF document text
- http://cx-gl.hu/images/files/25912596284.pdfIn PDF document text
- https://pilot-nav.com/ckfinder/userfiles/files/16546947912.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_off0000d284.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD284	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA96	16776 bytes
SHA-256: `c6a5df1fb6450d538fcf7c22c72f2fa4a4614998dde880ce029a828c4811d4f8`
`font_02_sfnt_off000115ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115AD	10212 bytes
SHA-256: `a3b0cf9aba2623048b324e9749c65c50b6a6e2cecda204332e8076111ab411ea`

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