PDF malware analysis — malicious · 6cb2dd75377227cd

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 7805d26454b37176c4f35b55ec64d773 SHA-1: 2752d2e109b7a2e8ef9811ba6f5a59f0412ca928 SHA-256: 6cb2dd75377227cda6023ace68ef9ca0f84dd308872100a193f507b06f43a1ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.6720

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 http://www.valathors.com/ckfinder/userfiles/files/54355661805.pdf In PDF document text
- http://commsoft.nu/demo/ktb/wsmbilder/files/56687010805.pdfIn PDF document text
- http://sxhk365.com/uploads/file///nawuzuxegevomo.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16084535416800---83290591547.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dbacd52fe656107c92a0a633f27f2f5c/gazibatomozup.pdfIn PDF document text
- https://littleitalypizzany.com/nbloom/fckuploads/file/tetazuroritexale.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mecaeiist13pqin1vmalo89dc2/lonajogodejigododuvif.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2d1df2d---9462456579.pdfIn PDF document text
- https://aljazeerahdrilling.com/userfiles/files/45069447232.pdfIn PDF document text
- http://diagnosticaedilizia.com/userfiles/files/19097583571.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/95482273655.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76746070945.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/samureruvu.pdfIn PDF document text
- https://zevkotodoseme.com/upload/ckfinder/files/67735608067.pdfIn PDF document text
- http://allprintusa.com/admin/images/file/botilosumotafisevop.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834b22725b4---wazulosi.pdfIn PDF document text
- http://studionegro.net/userfiles/files/zunijizef.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d57bd71c02a---bubovopidapegavodi.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/7775617834.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/tovifokagimarevanolakes.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/i0gm8c9k2j8v7os6j10taikh8l/mumep.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=yves+rocher+catalogo+natale+2019+pdfPDF 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_off0000e0ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8DC	20784 bytes
SHA-256: `938913ff9ce8f85e95b763675baa75f3fc2bef1d64552a19f66c0d0b28a23df1`
`font_02_sfnt_off00012f58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F58	11320 bytes
SHA-256: `de93862986212336d292be21e3fd96a6d73aae36a724e100762c048120e61318`

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