PDF malware analysis — malicious · ad98c660d3b8409c

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 21:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 2278999daa07c5f1ea2fe69aa0dfc4cc SHA-1: b12a10baf59adae1ae8087b1593f7f4bb907a3ed SHA-256: ad98c660d3b8409cb13f24f596925621743d78f9d091aabd3f281ff7f06ec2e9

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 detecting it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=does+olive+oil+block+pores PDF link annotation
- https://atl-50.com/files/file/jikofobomuv.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c70854a1---98915517534.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827459f2cd---monujipifakarufifisu.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c158f1b853f---raxewalawoliril.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a171cc4b10c---zukokolenebidepetewir.pdfIn PDF document text
- https://llsindia.in/FCKeditor/file/31661103361.pdfIn PDF document text
- http://folientastaturen.pl/_data/file/63842899852.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/68ad4afd8311b0ed1cdb73c5bdf213c5/71767879546.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/00450f795bfdbd6524642c1407b70d8a/zanovit.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/57067492004.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160743a20e6b74---napavubipoxaja.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c68e16a56c5385a9625c73a68da67c9/8099356573.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9ebc3efd---71284239840.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/bokanegabokozuxexa.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bba994b67ca---kaxedijegedi.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d5e7cb8d228059ee2928811a55dd71eb/libuwabalufaka.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c663d96657a---3322649573.pdfIn PDF document text
- http://andrelandberg.com/userfiles/file/34284860931.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/24341256325.pdfIn PDF document text
- http://trans-serwis.com/userfiles/file/95715879479.pdfIn PDF document text
- http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/runogireluwimatarumad.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf31660d3---bebexino.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4602d1b4a43770f0ab8a68f1d94834a/3594279931.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbade9e746---12850538044.pdfIn PDF document text
- https://soechi.net/userfiles/file/tirezapifuwegefetota.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_off0000ef64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001077b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1077B	10304 bytes
SHA-256: `655e2451df7589b23d15a393a9f4f229a8df36ae6adc74ca857bd3020b3a6b74`
`font_02_sfnt_off00011e8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E8F	18072 bytes
SHA-256: `cc87ec1d05a5a22603b428353b730627636363f7e655fd0e6f313d62ae3e774e`

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