PDF malware analysis — malicious · f0333065141424e6

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 13:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1f8bcd85c82607e9de7bcdf4e0c88a6f SHA-1: 8cadfd5881f2595f883b144365703fb193d0fbd4 SHA-256: f0333065141424e6c2a0a07dd96d6efef34641f6e18a5b451e296ce98e7d59bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=verbs+related+to+cooking+pdf PDF link annotation
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b69986c7---birekoronuxale.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116cf9f983a3---47877588768.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dea23d0218bed812aacaaf2684150a02/46131195962.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/55ae47e9528303803bae01203d540f29/tunuwufomirufituxetakasux.pdfIn PDF document text
- https://rrr71.ru/upload_picture/35072614289.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a078e828ba.pdfIn PDF document text
- https://maviet.vn/upload/files/79638059179.pdfIn PDF document text
- https://zegabilisim.com/calisma2/files/uploads/nenunamabozupi.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c271b2f47063dfd644cbb6398a1003f4/lotobolozulazunosal.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0138ca35a---46201244928.pdfIn PDF document text
- http://skolky.info/foto/images/file/23362951557.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1059784db---22111553792.pdfIn PDF document text
- http://campingwithconvenience.com/files/files/nupenefofoja.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/46980677138.pdfIn PDF document text
- http://cz-synergy.cz/data/file/59950326339.pdfIn PDF document text
- http://tagsu.com/attachments/fckattachments/file/77668809755.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f7dabb90---62016241565.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78dad1836e---poligafozejalovi.pdfIn PDF document text
- https://jss-moms.si/upload/File/7812997355.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ab01226ee62c22bf92e852ae0291af92/4080521328.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/665564cc919d1b2417b2337588113cd2/36616336467.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/zevanum.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/70555335195.pdfIn PDF document text
- http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/69814665589.pdfIn PDF document text
- http://crabandclaw.com/uploads/files/32168535905.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1quhk96lbriclu22eo31im8tsg/tiwixevojorezo.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_off0000e11e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE11E	18112 bytes
SHA-256: `e87b07d15cce5d9bbb22661e10f01f096bc9525087824b21809c082bdd082a9a`
`font_01_sfnt_off0001100b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1100B	10996 bytes
SHA-256: `c00cf4bada191aef009cd1295f2f671591bd573f3a0ee94176b25b874e125755`
`font_02_sfnt_off0001294e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1294E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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