PDF malware analysis — malicious · 1fe8da28f60ba679

MALICIOUS

PDF

126.3 KB Created: 2021-08-04 05:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f6649d4f9a3e6dbbed54baec8df9f2e2 SHA-1: 899403f623d89a41dcb49ac2e5dfc385105166cc SHA-256: 1fe8da28f60ba6795984b1457d51a60beb24c775a4735ec6c4d6d9c0f46e7a27

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9020

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://wecareu.net/ckfinder/userfiles/files/64141968570.pdf In PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/3ee12d9553013d0c014b144200125072/dopokopokujulesezisufuved.pdfIn PDF document text
- http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/revikujarenasukukevevu.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/uvj7m881v3cj1a9h1m3bnrnga7/mivatopojatorojon.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e63f6851b---zutusepil.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609af00ca4efb---futezurulusuladame.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/99bccd9343e1a2134ac55d8d3971645a/zunawuvixelaxupuwanufog.pdfIn PDF document text
- http://fujavietnam.com/images/Download/49928734731.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7ecbe7b8dfa744f187cce597d558c58c/74412016204.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ib7jp8ca5vg5h1444el8vb67ql/livetesup.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/81348825702.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/48359bbkpsfmaffddjglv9sd3a/25516024095.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d4beb1c398c01135140ea03ff7811fc7/20333468834.pdfIn PDF document text
- https://baoyi-chuck.com/ckfinder/userfiles/files/mipukegunoborakowe.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d10cb3790---befamola.pdfIn PDF document text
- http://benetworkingpro.com/ckfinder/userfiles/files/8118301783.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5000f457fbda2e2a2ca2f2dbec9cbab8/86652361325.pdfIn PDF document text
- http://myappartement.de/web/editor/files/selumotowipexezoxora.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7942a0122f---46188567788.pdfIn PDF document text
- https://szaniterplaza.hu/ckfinder/userfiles/files/72893061478.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ffp9n33q379k0acdgi505i0d5p/3269037382.pdfIn PDF document text
- http://lukoilmarine.com/ckfinder/userfiles/files/72354903300.pdfIn PDF document text
- http://ever0036.com/assets/uploads/ckedit/files/20210605150559.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/mopufupizosut.pdfIn PDF document text
- http://ablerexthailand.com/userfiles/files/mifebejo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+thomas+hobbes+best+known+forPDF 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_off00019402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19402	21212 bytes
SHA-256: `8c0623b5c1fe3f30380dd4395176184eb796f99a7a6f7bf3f22efd00206ba5f6`
`font_01_sfnt_off0001c88f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C88F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001e0a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E0A6	10744 bytes
SHA-256: `434c7476b83a4d64165f571f7a61b48c526e96dab65f76717bb5f5d148634b14`

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