PDF malware analysis — malicious · 38c1d8e813854109

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 08:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a884c871a6bfcfdef56a2249ab366477 SHA-1: e445a64901db2b2a14ae09acc1c6746db94f1327 SHA-256: 38c1d8e81385410906809799f346f9447e18ba2394f8401592bd2ed82adb8062

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to potentially malicious PDF files hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/91dbb35c955e3b2be918e6d3e8c7ff6a/xitimubepiz.pdf In PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd347f359---wulopug.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e54cc679f---dogesaweniwudos.pdfIn PDF document text
- http://pinturasoltra.com/images/slider/files/katiwerisaj.pdfIn PDF document text
- https://sananselmo.com/wysiwygfiles/file/belulodunibene.pdfIn PDF document text
- http://arabstina.com/ckfinder/userfiles/files/sidibimeluvamufa.pdfIn PDF document text
- http://fashioneducation.ru/userfiles/file/tepisoxelilizadotox.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/26481603789.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/1960343757.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9d83451ae8d8331f95bf3fed3ff8fa7d/pulorebamenulama.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/30335297714.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/vudarawo.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba241203a9---tujutunerozarofuja.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/5106691065.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/tatoragik.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bf616140---jufuzilikofulo.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepuriwidugefow.pdfIn PDF document text
- http://hangquangauto.com/files/tawabixasulik.pdfIn PDF document text
- http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/63649046253.pdfIn PDF document text
- http://songhandiban.com/uploadfile/file/2021062109381073499.pdfIn PDF document text
- http://bukharasuwanee.com/sites/default/files/file/jifidolurulawulosiv.pdfIn PDF document text
- http://tiszaikaland.hu/upload/file/89223670315.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=subject+and+predicate+worksheet+pdf+grade+3PDF 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_off0000d03f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD03F	17960 bytes
SHA-256: `1bf34c17e2595be02833e242148d4e9d954ee702079567339da1bc23aa56ed22`
`font_01_sfnt_off0000fdcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDCD	11648 bytes
SHA-256: `ca33796fdbbe30af4d55608481b8951461224c6a0cf94069615cd32bf7a5d170`
`font_02_sfnt_off0001191d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1191D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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