PDF malware analysis — malicious · df1d0349f958db14

MALICIOUS

PDF

97.3 KB Created: 2021-06-26 00:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3e2111e0540672644b27a2f9bb418629 SHA-1: e6baa12b3eccc551103c3874c546c3756e2646b5 SHA-256: df1d0349f958db14b1d5d2a327e8a4370cd2c813b82a5e5f9b0f0f9b92283535

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, specifically identified as a phishing trojan by ClamAV. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://irlanc.ru/uplcv?utm_term=medical+summary+report+pdf PDF link annotation
- http://evansmedia.ca/userfiles/file/kaviliwumisepejumurim.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/krsi102t993o67c9ckd0a33m0p/94480029923.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdfIn PDF document text
- http://simonide.org/userfiles/file/91293599620.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/79638417151.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/587b5f9a5548add85234fce74b051606/23506123032.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/13416826582.pdfIn PDF document text
- http://hondasushi.com/uploads/files/84002847303.pdfIn PDF document text
- https://scanclean.bg/upload/ckfinder/files/fadodo.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/041cb8a80a6adc380932131c9de6b9fa/timomulokudakow.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/zipexonazetitoluv.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674b81c031---josoviwalis.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/pejilonebobetoto.pdfIn PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5e7c77b710a6519434a4eb0804a49a05/78812393422.pdfIn PDF document text
- http://pierrevillers.fr/mairie_files/file/67953874912.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff5493d9f---58204922832.pdfIn PDF document text
- http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/70f696819d1fa8d2a1d729da05bde56f/zaxineduruf.pdfIn PDF document text
- http://alemotta.com/resources/original/file/kakinisajixulorugumifa.pdfIn PDF document text
- https://adikketiga.com/contents//files/98076349150.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093584ccbcae---woniwero.pdfIn PDF document text
- http://edgecs.net/documents/5456230145.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c7e1a2af---fafuturevedosebimi.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/43927995828.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2be0ee21a265b8da4d9b7c8078a9f6db/wosazemi.pdfIn PDF document text
- https://mariellatriolo.it/public/file/riwis.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8ccd09be45edec0e419c321ef55d425f/30909205105.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_off000116fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012f10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F10	18172 bytes
SHA-256: `b3f3f37ab43d4bec866580a82fc4a0e5572491bfa87daf22d7d667a55003b0f6`
`font_02_sfnt_off00015eb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15EB4	10884 bytes
SHA-256: `494c01c8f5c27c636c12513db7ab6a15078208e21cdff9acd150f4bcc3192e92`

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