PDF malware analysis — malicious · c82f1a7769d4d1fb

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 08:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1ed1dac9b6019069f863784f23f11b63 SHA-1: 88ece31558469981a59a6e2ce40941103db04b05 SHA-256: c82f1a7769d4d1fbe1e0f1ba60b2a27682b82fe10d3c9839bac68853c9814aa2

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links to compromised websites, suggesting it is part of a phishing campaign or a distribution mechanism for further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or the delivery of a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d0ba4693---79733457481.pdf In PDF document text
- http://grandrosso.com/js/upload/files/luzotawijilalofumesogu.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/84003e74d85b3088616e0044b88cd6f1/15108877467.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/12180123239.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/682c71e3661d87bc0a667594951211dc/24403007262.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3d92e3349977ff1efaa375edc7f505d6/11830410561.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/4685674148.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c36b22843930d8259a4b56f7c35f9d9d/1148782068.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2b846e73667c1be9cc053230690c46ba/15481675258.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/tepagisor.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5078656f7---10650919205.pdfIn PDF document text
- http://onlinemidias.com/ckfinder/userfiles/files/92239684581.pdfIn PDF document text
- http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/fofonevo.pdfIn PDF document text
- http://sireny.net/share/files/pibaribabuxoxudolid.pdfIn PDF document text
- http://luingpyrex.cz/foto/Image/file/julilutugizapeluxofev.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f387aedd3ff---13368425032.pdfIn PDF document text
- https://smartbrand.ro/mm/file/43292469634.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qoo4u9fr9n668jiqu29rmb2275/64201185462.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5f382d69d4fdbe3001872bbef1a54f37/visaki.pdfIn PDF document text
- https://ladangmimpi.com/contents//files/nerosesel.pdfIn PDF document text
- http://unipsyclinic.com/userfiles/file/20210812214416.pdfIn PDF document text
- http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5rqeh8rvmjti909m5132elnde7/47947374178.pdfIn PDF document text
- http://the100voicesofgospel.ch/fichiers/newsletter/file/jorivu.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/4917477019.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/g0l3slbauipa31lbuunafck2uv/duruvorofupalefenobawu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=internal+communication+tools+pdfPDF 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_off0000bb1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d335.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD335	10832 bytes
SHA-256: `f66ef79c68013532562f2dd2f92e6f3ecb03ede51c7fe2c96f8c3e74f13d8472`
`font_02_sfnt_off0000ec28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC28	15332 bytes
SHA-256: `d7a82c6d24f8f8ab8a9e30e610baab9d31e79b4293dc581d601132dc2cbf27aa`

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