PDF malware analysis — malicious · f23dfaa2825de35c

MALICIOUS

PDF

83.6 KB Created: 2021-08-09 16:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 8bfa82e61f3ff8f149eb7c713110ab1e SHA-1: c21e3c0fde97e4bfdde09123d30403e0b05a9c5d SHA-256: f23dfaa2825de35cd80cfc330188ccef6b24794d50390ae1f497e53d924563b5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cd6c4f9f---tudozozutedorotugejuvine.pdf In PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/36f9df24214605a8d7e1020c92a82509/viwod.pdfIn PDF document text
- https://baongochoa.com/upload/file/78417628532.pdfIn PDF document text
- http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fagewemuv.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce4133cfc---47336413568.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/kipem.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i52kf2sk2f73fg1ulado0lf00/77214798375.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dd1a8af2eaa614baeb141e77bb5c5a7d/75362136587.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0fbf18dbb0f3c3084db8d7b3d2e24465/vidapuzojif.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3b1abaa89b5f812efd859beec6169891/redelazu.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5080bb7c63---kekuwasojegukixutaj.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lt3hq1qgb3jis588kvchh6ctl/ruzejixobutemuxumifoda.pdfIn PDF document text
- https://aristi-trap.com/upload/users/files/3423777600.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104bc837451e---88445752037.pdfIn PDF document text
- http://beepost.vn/upload/userfiles/files/34079097024.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/92893544013.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d02bc4c7c---sebowel.pdfIn PDF document text
- https://juhaszautovill.hu/userfiles/file/72876756048.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/01agn2pqck9mn81t1ecnmt34q4/76103763164.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8cf45c5c---32533678538.pdfIn PDF document text
- http://www.dreamstoreonline.es/ckfinder/userfiles/files/56031698564.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kjpi721ddbo53ljf6lfmdfn9g5/51833787285.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/972cd5ab8d0b2675b04ee3537a5aa869/daduvorubesojoxaw.pdfIn PDF document text
- https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eb093b0e68a37cc04c014b97cc0df1b1/seforonox.pdfIn PDF document text
- http://mabo-meccanica.eu/userfiles/files/lonerilojopigavevun.pdfIn PDF document text
- http://hnc2.com/userfiles/file/35891023041.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=discord+nitro+free+crackPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e34b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE34B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB5D	17076 bytes
SHA-256: `21bb4d7f63691fc89b75ebf67b0d6501e799c252793b7ea0da05bbcd8c9916d9`
`font_02_sfnt_off000127b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127B7	10516 bytes
SHA-256: `29a39942eec4b4b0de3f28d23300e9db7f6af828a2171e501d94619cc0967b08`

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