PDF malware analysis — malicious · 8bb0d74da85fd50c

MALICIOUS

PDF

79.7 KB Created: 2021-07-27 02:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a79e930fe9041beefd1b38e68849647d SHA-1: ce979a316c5a561ca3c8b7312cf8694ff8042911 SHA-256: 8bb0d74da85fd50cbc5dbf455e2b764400dfe1bb9afc0da1888aab04bf7e99a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://noddy.nu/images/file/wobupozugujaloj.pdf In PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160874ce1532e2---93837720967.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087621bee85c---siwonajupumemurix.pdfIn PDF document text
- http://accomplishtheimpossible.com/userfiles_ati/file/91900310824.pdfIn PDF document text
- http://proxima-design.cz/files/file/75013053130.pdfIn PDF document text
- http://karate-talence.com/newsite/userfiles/files/79291840223.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a40bf67f28c01480bd00aebe5e3a382/povawetetefomarilas.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/v6mmlnvrtdbpca0235nau721j3/wenejumusorerinizodilo.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/73531365040.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5d4540a7---40512968991.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d9610753c07d7d601ea3514afe566e3d/44159922252.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/862e76e92325b46080f9e861df911e38/gizezavupizutabeka.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eb6f81ec8---bezelemejod.pdfIn PDF document text
- https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/7630501424.pdfIn PDF document text
- http://anandamsanyal.com/userfiles/file/xanugumulotidu.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094499aee378---27555973048.pdfIn PDF document text
- https://ncsccalgary.com/userfiles/files/debokuxugimipuka.pdfIn PDF document text
- https://avenue102.com/uploads/file/waxavizakexi.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/344fcdcc54ade48e82def195d211f18b/8661286855.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c5o0iqe60ggubo5kc7364tpqj2/4630176161.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2801b88dd---40374176042.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fb7e85b91b8f63d3d01724e7d3c72d99/40050733052.pdfIn PDF document text
- http://boatmonies.com/uploads/files/wasiv.pdfIn PDF document text
- http://mmbc.cz/_data/user_files/file/62803549042.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0e60d7dfd386a647fe56bb3a939ad5f1/jafopifobazukirokogi.pdfIn PDF document text
- http://retroldn.com/userfiles/file/togefidavul.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=descargar+driver+impresora+hp+deskjet+f4480+windows+10PDF 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_off0000cdc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDC0	17400 bytes
SHA-256: `8b81154cda4ce51fa325d8b5f7cfdb27322b1c67a11e553b130a07ad0945c77c`
`font_01_sfnt_off0000fa15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA15	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001122c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1122C	11856 bytes
SHA-256: `97b5fc228efe768b20f1d93017c41cc18dacf75600a2ffaf120aba7adf6a33f7`

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