PDF malware analysis — malicious · 3571b127d3583509

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 06:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 6967e853d4f6ded7f396aa68b6980532 SHA-1: b08dda9edd92d01eb0454f2a0687c65d9ca4da3b SHA-256: 3571b127d3583509825ef4c9128d26bfd2039bcfe4465a56a1afeaf8b89bcab5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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://infrive.ru/uplcv?utm_term=jet+propulsion+system+pdf PDF link annotation
- http://fine-cottage.ru/userfiles/files/faxekedekudewatumaxenax.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/80c87d91670a129a0339656cde0cf0d2/10421330213.pdfIn PDF document text
- http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/nezukakonedonifulawoni.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b59f3d05cc0016ba0531913625522d9a/5572477597.pdfIn PDF document text
- http://allycatering.com/userfiles/muwipumada.pdfIn PDF document text
- http://merklink.nl/site/data/ws/files/duwefimobuv.pdfIn PDF document text
- http://thomas-zigon.de/images/file/puropomej.pdfIn PDF document text
- http://zafirkort.com/uploads/files/dedatokata.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/vemomadulow.pdfIn PDF document text
- http://indecomavo.pl/inc/42840260984.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69894961bb---98502804369.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/00fa45824a34deec7187b0720b15cfc4/rurozuxutelawufopesinox.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095baa6f32e5---guzos.pdfIn PDF document text
- https://arerp.kr/data/file///40789580051.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210813005150259.pdfIn PDF document text
- https://motelandratecuci.ro/userfiles/file/66007698950.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bdec0978629eb0ef65d987d3852e382b/nogififokawikomaluwaw.pdfIn PDF document text
- http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61768711706.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/682979268db4e3b66e56811b43b2324c/novivixekiperupizifetima.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/560f3d1d4651e57cbfe100310eb54c39/48576055633.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d32cd360f3347bcf31e2f24ba500dc4a/fiwekafi.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/vuvavugizezo.pdfIn PDF document text
- http://scoutpate.com/userfiles/file/bidamisopujimej.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7aqf3p5qj9pvem62b4o45s2v11/26653411920.pdfIn PDF document text
- 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_off0000e5b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5B9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fdd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDD0	10700 bytes
SHA-256: `7c881597365d834ad63c70217b14a56116fb180cdff8340a3af1a67878d49e28`
`font_02_sfnt_off0001165b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1165B	15976 bytes
SHA-256: `0eff5a14c85b862d443f3ed3c0a054f3c5361c7a6d54753d1eb21d4b99958598`

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