PDF malware analysis — malicious · b0936371b8727a63

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 21:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a953135b495f6224a640130eb8d4f26b SHA-1: d7a61579dce5d1e2cdd47d8c14e072245fae801b SHA-256: b0936371b8727a635e3f4d78204f38f8a05acb317ef5fd39ed4ae530c0c91eda

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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://coretry.ru/uplcv?utm_term=chubby+young+gay PDF link annotation
- https://arerp.kr/data/file///pufakusaliw.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/wubojukibifomexelu.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/notujun.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926d2ad8310---83217273551.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/90f2d286c8dabc0e0196a79a2f7a3951/zegisefosexubetivanigeron.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0706f067a---29708008905.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/rowokivifarixexopaganajo.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ff44f7d2---bomudenunogokofakad.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/61166795971.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/502532678.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/kizorirar.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9d6615f5b40cebcf86b18d6edca51be8/ziposegolaxadubixija.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/58f1fee3631d078b3f97f4be75c2faef/ridovunajaravamofa.pdfIn PDF document text
- http://efuegypt.org/userfiles/file/jaridorobowiwoba.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d910bca24c---26343921653.pdfIn PDF document text
- http://ever-pioneer.com/upload/files/voxabifuraze.pdfIn PDF document text
- http://drivingschool-brno.eu/files/95008615612.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3d58f701e1fb62eab8d321418ec60322/20817377559.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f0979f0140e7ae98eb35fd7250cf94c5/komogi.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2vip12jci60d1e4e80j24ivnp5/21547465550.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9996dca6---diwoxadukurapu.pdfIn PDF document text
- http://jhferry.com/data/fckeditor/file///vogamo.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a9545708160---5922350467.pdfIn PDF document text
- http://pokorny-podlahy.cz/UserFiles/File/28872912593.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad1286ccd---41829047642.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/1302142794.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cf54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF54	10136 bytes
SHA-256: `9d5a5b3c64d2fef65c5b4f22a73303c72b7fb80ffb49c552ce86d80a86d8a341`
`font_01_sfnt_off0000e5e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5E3	16716 bytes
SHA-256: `0f6aee177858b7a2bf39eed55c06dc9a8bd519241223848d7894811b84bfed53`
`font_02_sfnt_off00011190.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11190	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000129a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129A1	17908 bytes
SHA-256: `536ded55ea169230bd8c37eb7349cbee3b3d51be78c56a66af8437bb4b954d8d`

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