PDF malware analysis — malicious · cf00005016891d87

MALICIOUS

PDF

65.1 KB Created: 2021-09-28 18:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b2eb50fdd4c12bc5abb93c1b7db8733c SHA-1: 0813346bfdfd4189499d775524b7c89f8aa4e70f SHA-256: cf00005016891d87aca9a3893c49dd2ebabe8dc76a4928ac17d55e682df1db1a

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.8055

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140af5111e9f---38020995489.pdf In PDF document text
- http://bjbtrh.com/files/pic/file/danamaguvaleneg.pdfIn PDF document text
- http://www.hydro-tg.pro/upload/file/49238313424.pdfIn PDF document text
- https://wemservice.com/ckfinder/userfiles/files/53968304791.pdfIn PDF document text
- http://www.cpiequipos.com/assets/images/user_files/files/30276254791.pdfIn PDF document text
- http://carshopm.com/js/upload/files/79006287124.pdfIn PDF document text
- http://fireprovietnam.net/luutru/files/24691332686.pdfIn PDF document text
- http://marketingnews.fr/images/file/nenutotazosopamikek.pdfIn PDF document text
- https://minhgianggroup.vn/upload/files/jolozel.pdfIn PDF document text
- http://teamhead.net/userfiles/file/denok.pdfIn PDF document text
- http://yuli-china.ru/d/files/galeritewisiwufomopolebal.pdfIn PDF document text
- https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/23003419132.pdfIn PDF document text
- http://aprt1day.ru/file/wigesapem.pdfIn PDF document text
- http://full814.com/upload/files/95611042126.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecd90558f9---14455677218.pdfIn PDF document text
- http://reanda.com/jingkelun/userfiles/files/20210901080249.pdfIn PDF document text
- http://dienmaythanglong.org/uploads/files/34419908554.pdfIn PDF document text
- https://anninhsieuthi.online/upload/files/39053539199.pdfIn PDF document text
- http://rockpapersun.com/upload_mce_image/file/36863907250.pdfIn PDF document text
- https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/86870550887.pdfIn PDF document text
- https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/tobevari.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/vubigebimidag.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409178b9f29---lutugila.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/21703076463.pdfIn PDF document text
- https://maytinhdalat.vn/images/uploads/files/23587518323.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hantai+game+apkPDF link annotation
- 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_off0000bf20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF20	16188 bytes
SHA-256: `800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34`
`font_01_sfnt_off0000d4d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eced.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECED	10244 bytes
SHA-256: `d96e6567bbe7c67d580e3182a9a90da6373a5bf6b0823ee5ae6b9e0c6353ad46`

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