PDF malware analysis — malicious · d55632f1c81c1998

MALICIOUS

PDF

226.1 KB Created: 2021-09-06 07:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 45cda78d337b779a5a4f3128a6b91944 SHA-1: c2db87e16f10eff2f8b33b9c7fdffc7303c3a155 SHA-256: d55632f1c81c19981f9e4a068e1e6977427d8c9a8809e5714b5082ba48b896a7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The presence of a 'Fake invoice / payment lure' heuristic, combined with numerous external URLs, suggests the document is designed to trick users into clicking malicious links. One URL points to a compromised WordPress upload directory, likely hosting a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9828

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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=nurses+and+midwives+act+2011+pdf PDF link annotation
- https://ddc-touggourt.dz/ar/files/lisoxeriliwolarenirev.pdfIn PDF document text
- https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/5031024765.pdfIn PDF document text
- http://airsoft1.ro/files/file/33024152475.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3d8d71f6---62574800161.pdfIn PDF document text
- http://htwy.com/upload/file/zekatete.pdfIn PDF document text
- http://luckdidea.com/ckfinder/images_store/files/mobape.pdfIn PDF document text
- https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/747b25cac952ab40d55490f146ea5432/wixubowa.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/pevijatu.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d349c2f3d5b74c6057ae015d901bbeb4/natuvetitosewuradu.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a9c4acc1b---3511574948.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/143r6v61u0riv990u9n0gm6chc/wefifomepijudum.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a298b372e3f9588a25b96386c5fd3e26/75604857373.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/e5d53c2d0d53b8d1753434c747dfe126/71651967225.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160938a42d2bfe---44287294983.pdfIn PDF document text
- http://lafiestadelmoto.cz/files/file/jigowemolexaxemexokow.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f0b01f5e0bb06e636d23503a72ad3a4d/81734830847.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/11612cbf9f859b699c5b916c6c111f8e/zujapavujujevefowowakoki.pdfIn PDF document text
- https://ganganagardentist.com/userfiles/file/1705781017.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202108022018049209.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2cfefa87ed3a4a83b92f41d271bb5f1e/wanogijaxetidapuvo.pdfIn PDF document text
- https://avayemehr-carpet.ir/data/file/bopegilawopakenasomozo.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79de06bab9---44498420786.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087c6eae650---43172576496.pdfIn PDF document text
- https://schilderlesvakantie.nl/ckfinder/userfiles/files/78490989777.pdfIn PDF document text
- https://tkquiz.com/userfiles/file/44232708678.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_off000313af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x313AF	11136 bytes
SHA-256: `baa67312f56fd18af703a864dc77270a282648b51a07a8c1e20128ffcde5a8ee`
`font_01_sfnt_off00032dde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32DDE	20108 bytes
SHA-256: `c102f0bfed6dc2611ae348b6c00b9b01ed79963baaa2f6bb07446ed12d5bb822`
`font_02_sfnt_off00036174.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x36174	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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