PDF malware analysis — malicious · c592dc1bd20fff3f

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 08:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f28be870dee098a3a0a39d7bcedab2a0 SHA-1: 6c6ab2f9e2df8e96f064e6febb8a8d32d9a9121e SHA-256: c592dc1bd20fff3fd10721445e59b9ab4255affdc41f20add61514568f40fa96

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple websites, many of which appear to be on compromised CMS platforms. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns suggest this PDF is designed to lure users to external sites, potentially for further exploitation or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 5

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://horacebatten.com/ckfinder/userfiles/files/73534925474.pdf In PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc6d033fc---88038342133.pdfIn PDF document text
- https://bamfieldrental.com/userfiles/file/voxirobolelemebixize.pdfIn PDF document text
- https://totounited.com/contents//files/14041639227.pdfIn PDF document text
- http://ankaser.com/userfiles/file/15064252078.pdfIn PDF document text
- https://zhansq.cn/upload/file/wavuxakunexizajumanug.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/83307884125.pdfIn PDF document text
- http://karunb.com/UpLoads/files/91194587433.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba1412f85---66155872486.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e94afff3f27---6040200432.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/64e64395d567c706c31bce96bf624826/fidumaneforugojuwivawiwer.pdfIn PDF document text
- http://ourdesign.hk/ckfinder/userfiles/files/bevazuvuzasevozemuz.pdfIn PDF document text
- http://cocoal.com/uploads/file/tejolowewowupawupudivi.pdfIn PDF document text
- http://clubmaniacr.com/campannas/file/bipazizifetujawemug.pdfIn PDF document text
- http://premiumdrinks.eu/userfiles/92012721852.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/57218878201.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/70913476240.pdfIn PDF document text
- http://autoscuolemontagna.it/userfiles/files/11534827855.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/39tq3kvniqfv8kbk2jspbjc0s2/rufapojepukotogozepin.pdfIn PDF document text
- http://cmi.nfe.go.th/ckfinder/userfiles/files/19276470689.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hoq0cjfv486fhaicbabme923g4/83782111353.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73356e4fb---lumowuxafinosuw.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/03174a737d02baf38532c858d90711e3/rogugurota.pdfIn PDF document text
- https://maintogelonline2.org/contents/files/64453949509.pdfIn PDF document text
- https://store-connector.com/_upload_bilder/_filemanager/file/56520838565.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4abd81e6---2723304438.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+30+squaredPDF 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_off0000e389.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE389	19144 bytes
SHA-256: `e1abb237e495d8e752a72c718c42718d1e624bc9dee38d3091a6826c58e70dbe`
`font_01_sfnt_off000114a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012cbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CBB	10608 bytes
SHA-256: `bb3c57804d64e8539c22b75c078b0968375aa14d0dea765f6e0704572e2f7700`

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