PDF malware analysis — malicious · 6a1fe058d4d1a2f8

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 10:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 423698edfc25acd292cfd95ad88db8c4 SHA-1: 09b03a1553161497213e42c46c712a64afa9f790 SHA-256: 6a1fe058d4d1a2f81f1c67ed246adb58d97c985242f9a50d8da470ef2a876539

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised or disposable domains, 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. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://villapellegrino.it/userfiles/files/87852876219.pdf In PDF document text
- http://avesta-hmora.boj.se/uploads/userfiles/files/25789090170.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/33fb62524162489921538daf4c7d0b4d/26736220469.pdfIn PDF document text
- http://leguido.net/files/99262997046.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/22088350296.pdfIn PDF document text
- https://laflammerouge.ch/userfiles/files/62527467309.pdfIn PDF document text
- https://congchungnguyenlieu.vnpec.xyz/uploads/files/21130218946.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/bekowatobeladen.pdfIn PDF document text
- https://performanshost.com/calisma2/files/uploads/74646540391.pdfIn PDF document text
- https://www.koreayokogawa.com/ckfinder/userfiles/files/30901764152.pdfIn PDF document text
- https://tcremich.lu/files/files/20437553066.pdfIn PDF document text
- http://pjteam.hu/uploads/sipikuvivoxefi.pdfIn PDF document text
- http://henskeschildersbedrijf.nl/upload/furazalutodisogi.pdfIn PDF document text
- https://biroestarsa.hu/uploads/file/gubalamipafuserupebaw.pdfIn PDF document text
- http://ckm-machinery.com/userfiles/files/22480206840.pdfIn PDF document text
- https://bjjewels.net/nbloom/fckuploads/file/samuvifonumamokanaxu.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8c35de9fca8e9ce8c286b09b8c18e77c/5757092974.pdfIn PDF document text
- https://movingalpsfoundation.ch/userfiles/file/wuxolufuwugakegenevanoso.pdfIn PDF document text
- http://donauwell.at/userfiles/file/4748359086.pdfIn PDF document text
- http://warwick-ems.org/userfiles/file/kapavebe.pdfIn PDF document text
- http://honeycontacts.com/uploades/userfiles/file/pebolamajiwosirera.pdfIn PDF document text
- http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/puxefotujufevozozope.pdfIn PDF document text
- http://designbyjoseph.com/uploads/File/97884704115.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff997b98c9---27218060718.pdfIn PDF document text
- https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/35649568299.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=survival+games+on+phonePDF 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_off0000d691.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD691	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA8	10840 bytes
SHA-256: `d4d07ce5ca37c8c901cd9b9683036b32085a6d019e82d1d1b868bfbeda2d4d3e`
`font_02_sfnt_off00010769.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10769	17700 bytes
SHA-256: `673366fc587e39e8ff3ff73ce71bf351d5dd0919325bc3ef2a6952d44c81d130`

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