PDF malware analysis — malicious · ab43d5d0b8d25bbf

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 02:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 97ba2cab2f91671bd40192a629bd435b SHA-1: 75507b7ae51069517f510caa775833a6dab4f1f1 SHA-256: ab43d5d0b8d25bbf083432795691af535768f82e20a26808573f1176d88c3695

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a malicious link farm pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/47e7e8780ff8119cdfbfc6674c293bb6/65182818166.pdf In PDF document text
- http://ozona.pt/wysiwygfiles/file/wobuvazaxapoguzofagetot.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/96040374396.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782e2bacd---5290439337.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a8d8853b7f2fdb13b78ce198361ddd38/jixutodezovadepetorug.pdfIn PDF document text
- http://nabisori.com/userfiles/file/lovobazepitetanixito.pdfIn PDF document text
- https://jackinthegymtpe.com/uploads//files/202108020927328465.pdfIn PDF document text
- http://growlink.biz/userfiles/file/liruguzigadakukudidor.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff05a8b8300---31088002826.pdfIn PDF document text
- http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dazinikidupixaziwib.pdfIn PDF document text
- http://avstralianature.ru/ckfinder/userfiles/files/29770807729.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e1b21f55---zojunalewotugu.pdfIn PDF document text
- http://fini.hu/userfiles/file/30478637948.pdfIn PDF document text
- https://syntellect.ru/Repository/file/mogogodupozese.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec506e3b70e---simomodisiboragiv.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074466dea9f5---34942106.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a720257f3a---73100364837.pdfIn PDF document text
- https://muratay.nl/userfiles/file/89206058875.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30ab49644129a2d5dc28609fa4731c35/rizevapavukasarosuve.pdfIn PDF document text
- https://novsport.com/content/File/78011811221.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5300b9c8247ffaeae18b55438f30d864/75810268224.pdfIn PDF document text
- http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/12238460651.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b87f04b---68671112331.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/lelug.pdfIn PDF document text
- https://anjingliar2.com/contents//files/7845067261.pdfIn PDF document text
- http://citywideok.com/clients/75789/File/82574704672.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=10.s%C4%B1n%C4%B1f+almanca+%C3%A7al%C4%B1%C5%9Fma+kitab%C4%B1+cevaplar%C4%B1+ata+yay%C4%B1nc%C4%B1l%C4%B1k+2020PDF 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_off0000d5ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5EE	18216 bytes
SHA-256: `26e29e18a5e4d48bfeaa9800ac8b7a57ca04f5bf5a67fb4a828c2652b3c1a7a6`
`font_01_sfnt_off00010360.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10360	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B77	11680 bytes
SHA-256: `bab73b311241458dadaaf7efabee1fffcfc393f56d6584db89934c10cee601be`

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