PDF malware analysis — malicious · dcfc58b4fa2103ae

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 11:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 0596515f672a1cf2843dd590a91baf06 SHA-1: cd60b963c06d9dc4c817b72e7bf9b496e6fdb539 SHA-256: dcfc58b4fa2103aee934d8ea4a0b619235d4c94700005bb41b5228a42b43dcd8

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a visual download button and numerous links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://wastran.ru/uplcv?utm_term=di+questions+for+bank+exam PDF link annotation
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5f1e490872b3167c1d9ae71b1b9b07e4/36592374258.pdfIn PDF document text
- https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607123d7c2b36---7780791590.pdfIn PDF document text
- http://olimpic.hu/ckfinder/userfiles/files/14206892286.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c0d29554f---wotokufikelipojenigogopit.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f975e93ef---gidazowap.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a59bf3b2---xozolotewuxovagube.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4d20e01721c536bddc833cc7c90b3120/41527359727.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952d1ee24b6---79208975105.pdfIn PDF document text
- http://mariekevanvlierden.nl/survey/userfiles/files/dupemiwuvuraka.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/gufonusoriloloxuv.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c209b6d0ce2---bekewuxafovapemogedixas.pdfIn PDF document text
- https://rotterdampools.com/contents//files/xavuposavikenefajoniz.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/20895902824.pdfIn PDF document text
- https://vnsteeldetailing.com/UserFiles/files/46260943230.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d96cc92f41bb52e73fb2aac07bd647/54578561535.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7498f59a57878c94f447e5c1c538f103/11500491786.pdfIn PDF document text
- https://airbays.com/userfiles/file/90893245351.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d74645ad2c05db9eb8c099aeb96aea6f/4234824697.pdfIn PDF document text
- http://yokohama-model.com/userfiles/files/wugigidolenixorido.pdfIn PDF document text
- http://tcihk.com/userfiles/sujojulabazef.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/87tis9p182v4j00ounaid2lbh0/silezuxisifa.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_off0000ef1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010730.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10730	18000 bytes
SHA-256: `a3db004978594394814a81fefcdbd231983072e2cdc1f97b5abb2a198132dcf1`
`font_02_sfnt_off00013676.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13676	10912 bytes
SHA-256: `88be52a754d173f89b45df83613be20c95a9dbe402b5de97a9bcb6c068949983`

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