PDF malware analysis — malicious · 4e35bf8d9ae52021

MALICIOUS

PDF

141.3 KB Created: 2021-06-29 23:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 507c54103a4da366ab8b1b8ea2510d75 SHA-1: ce64c300a2b03c705ffc544f15a487e1f0386ab1 SHA-256: 4e35bf8d9ae520212b94f89052486cb3ec82bda1905257196c266541a74c7519

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised or disposable domains, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9323

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://jakspravnenapsa.cz/userfiles/file/puraretexajevopova.pdf In PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfa7d3531---vewafujivexi.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04abb63163---19236170195.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b77040805---juxizomaw.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eec4358e1---77300855959.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/putajabinetajuf.pdfIn PDF document text
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e5ad0aae0a4c5c69cca65288a453668d/24061220718.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6sgp92d915ejplhgsur4ijo0e5/wafunovugi.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae343a504c9---xevenifotavivo.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454658900---lexavolaseboso.pdfIn PDF document text
- https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d4a5f14de6feb629fdcd0ea0c82da38c/91106541951.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/26722389246.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/duxula.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e49fb3a298ab5bc33d1278fbe2472b37/rasojugi.pdfIn PDF document text
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/b122a6e0f7174d507f8abe1467f795ff/zuwiresevowulilafegezud.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af15d6ecb2---wuvoranikopaxe.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cecc54cb3c7415be3ef065ab4cc075a4/zezute.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6fc93fa28fe9fd5fc664edf86da63771/xukazumoporan.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5519e6919---rexivobuxufolifu.pdfIn PDF document text
- http://maility.pl_adresuserfiles/file/joxeramar.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de434b91ac---xonatunudusob.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada50c0bd00---8830587778.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5448dc469---latewuwagowagatesinu.pdfIn PDF document text
- http://cc-loges.com/uploads/file/94168430160.pdfIn PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/zujaxotitudarutusareneke.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/46235410800.pdfIn PDF document text
- http://blpest.com/UserFiles/file/soged.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=portal+weighted+companion+cubePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001b75c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B75C	11120 bytes
SHA-256: `176e0f44816f1ea7d21a636af860323977448e2aca98404980294a61e09be20c`
`font_01_sfnt_off0001d0b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D0B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001e8c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E8C5	19428 bytes
SHA-256: `bc2226bc6edbf9dbd5e5494d965c4aa546f8a4b4ddf49b1c003f33860e893caf`
`font_03_sfnt_off00021951.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21951	3464 bytes
SHA-256: `f1689a018e6ae99f249f3c664fde0f3027365bc5161c29e1eb2f008b024335df`

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