PDF malware analysis — malicious · 4db524f56523d513

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 00:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9d5fa9a573816febc6b73b248dbeee32 SHA-1: 0f4d0002f5dbb4890fd769fa93d2f97d8cad02ed SHA-256: 4db524f56523d5131ebcb3b7ca386febb40511498e89aa7e8c147be09ce70e25

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document's structure and content suggest it is intended as a lure, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=writing+compound+and+complex+sentences+worksheet+pdf PDF link annotation
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nqkf1dt5pidevftpge1mdeh58o/zajuniwij.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/68835616062.pdfIn PDF document text
- https://www.aaptuk.org/ckfinder/userfiles/files/48851065128.pdfIn PDF document text
- https://www.prieur-equipement.com/ckfinder/userfiles/files/57920384561.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e64370ae3814b6cedecf885f26e4f2a5/tisusupakegotixiw.pdfIn PDF document text
- https://yepsell.com/userfiles/files/13705284475.pdfIn PDF document text
- http://ranch.pl/files/file/bufarizupumuzulawe.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/63c2c65649ba7e7fa001d6efd225be92/nelaxubaxijuvebagogerezeb.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/dafisabijefosupibut.pdfIn PDF document text
- https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/37178511488.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b06ed7c58b---7874568913.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/95415632196.pdfIn PDF document text
- http://hopkinshigh1961.com/clients/878968/File/72082025814.pdfIn PDF document text
- http://kunmobile.vn/files/uploaded/20210801/file/29836048133.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed0bf2cc8---72719634170.pdfIn PDF document text
- http://midlandhigh79.com/clients/866549/File/86486997862.pdfIn PDF document text
- https://tselectromechanical.com/uploads/CKfiles/files/1524603333.pdfIn PDF document text
- https://triptoboloyfoundation.org/editorsfiles/files/disotavibexuz.pdfIn PDF document text
- http://dmychadla.eu/UserFiles/File/nevasidisegelakilexufajug.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d033233b2f---sisajogo.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/82450ebb505db8d245164698db274e8b/183227478.pdfIn PDF document text
- http://aimic.com/userfiles/file/30105729281.pdfIn PDF document text
- http://bienbao.net/uploads/files/20984547081.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/modezabozisalakewaruvixo.pdfIn PDF document text
- http://wajl.net/img/file/20216810642.pdfIn PDF document text
- http://smartraoptics.com/fck_filemanager_upload/file/58556086597.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_off0000c56e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56E	16240 bytes
SHA-256: `e3302191544ed5bb93f1dc9801999601808b900123b20b93c47c9506b58a9c4a`
`font_01_sfnt_off0000ee97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE97	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000106ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106AE	11440 bytes
SHA-256: `90631be93806408944ac4b063a11157e20202400744e718446c0e57cf9154d53`

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