PDF malware analysis — malicious · 4a4b3035f696cd34

MALICIOUS

PDF

92.4 KB Created: 2021-07-25 12:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 4ced86726ebe3609dbfc300459ea0795 SHA-1: 0c872a857cbcff7b1af7d43ab45a921d29f21685 SHA-256: 4a4b3035f696cd34f2b906e43db61cf23d5d146bdff36998ceac2390a5c25289

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 6

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.
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://xlspandoek.nl/userfiles/file/mefozeviwakudenogo.pdf In PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b220cba2f2f---wewesovi.pdfIn PDF document text
- http://asianaccounting.com/admin/fckeditor/userfiles/file/50971546914.pdfIn PDF document text
- http://zonazero.es/userfiles/file/8064779381.pdfIn PDF document text
- http://web68s.com/upload/files/97736913241.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6a24225b1---13513727019.pdfIn PDF document text
- https://hantverksakuten.se/ckfinder/userfiles/files/sawofodegilozovexinup.pdfIn PDF document text
- https://echipamente-scule.ro/userfiles/file/dakosapafakuw.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081214aa472b---varopegudonum.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/ledejekifo.pdfIn PDF document text
- https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/vugatoromob.pdfIn PDF document text
- http://clubselectionvoyages.com/images/file/14913711259.pdfIn PDF document text
- https://rcot.org/userfiles/file/xuzepotebenigupuf.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607169b12d1c5---keteguxafekedatukut.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b80503093e0bdf2753fa8d9961314a08/82951885966.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd85b193c---supawatel.pdfIn PDF document text
- http://valeneighbors.com/userimages/2356249437.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d81f976c8fd058b3b15e5dde262fcac8/bukanadagigokanorodeb.pdfIn PDF document text
- http://poorclarescork.ie/images/vinejikoxotidefusipag.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/biwiko.pdfIn PDF document text
- http://nfc.soo.jp/file/98412959398.pdfIn PDF document text
- http://jjkxmy.com/upload/files/202107241747024122.pdfIn PDF document text
- http://debden.org/userfiles/file/67465582594.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+the+alien+containment+in+subnauticaPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ed2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED2F	17864 bytes
SHA-256: `f52439b5a0109ca1ff187728120a8fb2b6afad5055fdcaf2ac353c22edae8fed`
`font_01_sfnt_off00011c37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C37	10896 bytes
SHA-256: `b12022edf12afd2415bb73797cd086757e10b4cfac0e8de896a6e1e9f4974b6c`
`font_02_sfnt_off00013546.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13546	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014d57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D57	16144 bytes
SHA-256: `94ada888842219b54f0bff61c05754c95ee5bc28b4560123b174b2ad5ef12220`

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