PDF malware analysis — malicious · 5688591b76d95e9a

MALICIOUS

PDF

100.5 KB Created: 2021-08-08 08:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 43462f6b10583d85f0a5886c08a34782 SHA-1: 9a393009a716a00f7e8f9274ca7115cdb4cc281d SHA-256: 5688591b76d95e9accc0c58c2050239f5b5ab3df00eb8807e0fe33b2e7f624ef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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://irlanc.ru/uplcv?utm_term=alliterated+sermon+outlines+pdf PDF link annotation
- http://matsonconstruction.net/userfiles/file/4863290820.pdfIn PDF document text
- http://leton.pl/userfiles/file/sekigarire.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8af26e01---39184240223.pdfIn PDF document text
- https://angelsforwarriors.org/userfiles/files/21523928498.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec1a680bc.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077847b35249---ranesigumejobi.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/jixakafejafodufevisem.pdfIn PDF document text
- http://makinsushi.com/uploads/files/1268402375.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeff10a4aa---48410527821.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e0b201102dfac1fd44557b1bb8e76838/jorororepusase.pdfIn PDF document text
- http://onestep-tokyo.com/userfiles/file/ritame.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a988a9840f---53631858930.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8683945b---35505241559.pdfIn PDF document text
- http://alkanboya.com/files/file///parobumorobidogogive.pdfIn PDF document text
- https://ctsgroups.asia/images/file/tijopevukazugedatokokapew.pdfIn PDF document text
- https://genegurumiraclehealer.com/userfiles/file/texonaw.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38f8d7613---sowedajojomesorikutok.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gp7joo2829ebto13ht0tova0om/poxuxu.pdfIn PDF document text
- http://hocikto.info/userfiles/file/4102796754.pdfIn PDF document text
- http://elitaliaweb.it/upload/file/wexit.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9688fae1e7---86785117838.pdfIn PDF document text
- https://artenika.pl/fck/file/widusulajaben.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/94796748906.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a68bd7093c77305e96c50e843068f594/65060761131.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_off0001246a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246A	17764 bytes
SHA-256: `f011d2ebd04203fa581e439074543bcf327a3e955570c8874b6b6ad82ded5a0d`
`font_01_sfnt_off000152ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x152EE	10740 bytes
SHA-256: `add43990f2eab52ec09ae125df1a655f6ddab70488b36c4afa106b026255378d`
`font_02_sfnt_off00016b96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16B96	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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