PDF malware analysis — malicious · bb045429c01b50ef

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 18076df9efd629767b58db243c7c83c0 SHA-1: f9324e078fc080c3576a2f5f9fd673ed1512e2c2 SHA-256: bb045429c01b50efd34cd9ea2316435470c0ea19b48ed6bd4744228efe3c2ab1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links strongly indicate a phishing attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crysiq.ru/uplcv?utm_term=juan+carlos+onetti+pdf PDF link annotation
- https://szaktel.hu/uploads/file/fijabolotefalug.pdfIn PDF document text
- http://dentherapia.hu/files/file/buwofedipupagedupotokike.pdfIn PDF document text
- http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/21150416032.pdfIn PDF document text
- https://topclassgreenery.nl/images/file/40805354516.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0c63d93f8---lelubaf.pdfIn PDF document text
- http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/riravokodexeli.pdfIn PDF document text
- http://metallpress.info/files/58577752374.pdfIn PDF document text
- http://bkht.vn/userfiles/file/jozesogu.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/66afe00761cd24f9fbd1c5fc2b7ff7ce/bitusu.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fd93cad55087a540c9a18a631c9234a4/3840601924.pdfIn PDF document text
- https://gulfsupremesa.com/ckfinder/userfiles/files/gukikemesanidoterowisamol.pdfIn PDF document text
- http://engroupe.ca/aym_image/files/1676045171.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g0phof627ejve46qoki3g22d24/vonaxajaw.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0abff531cb---12402952345.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77083c7a1---83996709497.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d958aeaa135---melekisodupu.pdfIn PDF document text
- http://myjobcareer.net/userfiles/file/2021062304320473499.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/5527604879.pdfIn PDF document text
- https://gogreenonline.net/userfiles/image/fckeditor/file/9538778358.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/05/14/file/20210514_041737_192.pdfIn PDF document text
- https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dabujugofelurapoles.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b54731d0b2c897f24c96886d6081806f/17873810626.pdfIn PDF document text
- http://salonmysliwskirys.pl/userfiles/file/35735365002.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a817c38e---55008447941.pdfIn PDF document text
- http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76322915175.pdfIn PDF document text
- https://foundationkuzmanov.com/files/nukokejadiwono.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_off0000ca2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA2F	10704 bytes
SHA-256: `0eab0563ae3b3aa7bd70464ec84eaf821326f80a9380ce4146ac52cefc4b8cfc`
`font_01_sfnt_off0000e2e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000faf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAF9	18660 bytes
SHA-256: `f729e998e23b81eca6052937403f66d1a3ef3a1de2c8f53db76b2114d6b34c32`

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