PDF malware analysis — malicious · d3200540c0a6e220

MALICIOUS

PDF

72.7 KB Created: 2021-08-30 14:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c0991f5a5df712bcd113ac9d2f3c9012 SHA-1: 6cf9c30e6657983ff344243953bb29d4daa67217 SHA-256: d3200540c0a6e2201dfc5d3a2bb7454b4ba97da25f5b3d7dba4e139fd13a4119

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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=buffer+practice+problems+with+answers PDF link annotation
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83f662b7e9---8302448381.pdfIn PDF document text
- http://tokstar.com/_UploadFile/Images/file/koterekofuvepigubugipi.pdfIn PDF document text
- http://hiro-seiko.com/upload/files/60377143847.pdfIn PDF document text
- http://augustaelectricalwork.com/editorData/file/20547984431.pdfIn PDF document text
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1fcc7716a2db7b4bfa10b3bb2919e79c/wulakivonaruxagipakix.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a17d941bc---lizewega.pdfIn PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/fofiwozufobovifi.pdfIn PDF document text
- http://madmojo.com/fckupload/file/68905043500.pdfIn PDF document text
- http://konditsionery-odincovo.ru/upload_picture/file/rudepizirufofurupow.pdfIn PDF document text
- https://bharatbiodiesel.com/userfiles/file/gisuledafifobunemef.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/tagaxa.pdfIn PDF document text
- http://aloisiquadri.it/userfiles/files/lewinoj.pdfIn PDF document text
- http://centrons.com/uploaded/file/190436037561086efe8f361.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08d24992f---zejokivakapux.pdfIn PDF document text
- https://keralahappyjourney.com/ckfinder/userfiles/files/fafuj.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/futecf1fasvr8i9em9n87k8jm7/24680488516.pdfIn PDF document text
- http://braghieriarchitettura.com/userfiles/files/68890468010.pdfIn PDF document text
- http://prodottoitalia.eu/userfiles/files/54057532154.pdfIn PDF document text
- http://circolonauticofavignana.it/userfiles/files/vojapovuzudine.pdfIn PDF document text
- http://deurenhanger.nl/userfiles/file/revotidu.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/79701890080.pdfIn PDF document text
- http://ghioroiu.ro/sites/default/files/file/nifuxerewodagujuxagore.pdfIn PDF document text
- https://mountmoriahcamp.com/media/82819933780.pdfIn PDF document text
- http://hocikto.info/userfiles/file/93341348201.pdfIn PDF document text
- https://ehotelgateway.com/bot/ckfinder/uf/files/mupaligonenosalalok.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_off0000ba1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d22c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD22C	16296 bytes
SHA-256: `23008fef31822f7ea4d6c8d81c263336c498979e2b8f97780a09e2d579687178`
`font_02_sfnt_off0000fb85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB85	11124 bytes
SHA-256: `36c9b216e6c9489fa0a2f5ed5986ec360aade1eed576e90c74e746c1f7ba1147`

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