PDF malware analysis — malicious · cd90dc1b019bcf29

MALICIOUS

PDF

99.5 KB Created: 2021-08-12 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: 4764f58939848dcf1aea5c3271eae9ab SHA-1: 4e4b166bfabdc43f9273fb780cd621970c5782d7 SHA-256: cd90dc1b019bcf2923a18be3d46aac372e5ebbd420194a0488a7ee2bbd5da06e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The primary purpose seems to be directing users to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9875

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://crysiq.ru/uplcv?utm_term=cryptic+story+the+star+spangled+banner+answers PDF link annotation
- https://wildarium.com/ckfinder/userfiles/files/kowakuvelazojiko.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/56243250819.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3fe44e13b---mulorilenenawovenufesuki.pdfIn PDF document text
- https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/8drpa869ipf6li9kr8ve6flr4p/52599339446.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/n1dd34shgfnfccq2b5svvks14r/gatadimufemivivarinakif.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tcrl0u4qq3u8jvfqhd5cjomf89/94427607657.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160782e1de1100---vejodazorez.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/51u7o09r2i8quh6tlu2ln7m8g3/44118814597.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f6cd8acf---lifutabife.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b9e9ccf4---1438803714.pdfIn PDF document text
- https://divanich96.ru/admin/ckfinder/userfiles/files/jirosutirajat.pdfIn PDF document text
- http://retroldn.com/userfiles/file/50166740696.pdfIn PDF document text
- http://tourbusan.net/FileData/ckfinder/files/20210725_6EADEC2E93A2BCC6.pdfIn PDF document text
- http://cybernet-ap.com/UserFiles/File/tavopejijusedigupa.pdfIn PDF document text
- http://maybomnuocdanang.com/uploads/image/files/surodob.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2162eb9006---mipig.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2169fa231f384da671770027bd0c86cf/pawuxigefon.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a4da4250a23b2aafa8f15ec792d7a476/59245822937.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/26847811877.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ea76i92vh6hnb9h70adqa2hh8p/74089109547.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f6b1b7110e79843428000f81e926a426/jusalowuv.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/zemitazuk.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10a533e90431a4b519a473b206805ed7/wopojafesunofowexemogofo.pdfIn PDF document text
- https://hpsoft.shop/upload/files/98917578828.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vazokorokete.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c9d88eb3b8a1ab11790eeeba8fac924f/38335536044.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_off0001223e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1223E	17200 bytes
SHA-256: `2af76462d6939dd233aed9accc0320865095d8342ca637e6c7062164cfe8c374`
`font_01_sfnt_off00014f07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F07	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001671e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1671E	11164 bytes
SHA-256: `5990fb6c627ce0289352b04160f94ed01dcf527f7599d5d1045c34ebb1f5e25c`

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