PDF malware analysis — malicious · 16cdb9b2774e1b83

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 07:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0ced6f99262ac87dbcfba4334446b264 SHA-1: d1a10aec3fb35ea225eec05d732a55ebba532e10 SHA-256: 16cdb9b2774e1b83c57f79bc03c6ab9fc542fb663e198eb91bd7bbf219518dd5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, pointing to compromised CMS uploads and disposable hosting, with URLs containing 'utm_term' parameters suggesting tracking or phishing campaigns. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=open+messenger+group PDF link annotation
- https://dichvuketoanvn.org/uploads/files/wopafimuwikivesalom.pdfIn PDF document text
- http://china-engine.net/ckfinder/userfiles/files/14535885593.pdfIn PDF document text
- https://nakatarikaszel.pl/app/webroot/userfiles/file/tefumekexaxujogusizetak.pdfIn PDF document text
- http://archiprojektai.lt/app/webroot/uploads/userfiles/files/58824673005.pdfIn PDF document text
- http://chronocertif.com/userfiles/file/natijokifibojejegejujila.pdfIn PDF document text
- https://duvanco.be/docs/files/lugunetenowagavonima.pdfIn PDF document text
- http://finance-bulldog.cz/UserFiles/File/55803288738.pdfIn PDF document text
- http://cherriestattoo.com/ckfinder/userfiles/files/49552195107.pdfIn PDF document text
- http://dallard.fr/ressource/site-image/files/mumafagimovad.pdfIn PDF document text
- https://2ruoteexpo.it/ckfinder/userfiles/files/jiradorabol.pdfIn PDF document text
- http://4darchitecture.org/img/all/zifoba.pdfIn PDF document text
- http://puzynowska-kancelaria.com/userfiles/file/rozagapebowibifaf.pdfIn PDF document text
- https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/16874102160.pdfIn PDF document text
- https://miltonmattox.com/userfiles/file/99212223118.pdfIn PDF document text
- http://gatewayhotelbangkok.com/upfile_hotel/files/51005691434.pdfIn PDF document text
- http://amadpich.com/userfiles/file/getidiw.pdfIn PDF document text
- http://g-shocktou.com/user_file/file/83104277918.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161352dca8e7da---89370748953.pdfIn PDF document text
- http://m3hotels.com/userfiles/file/74092944148.pdfIn PDF document text
- https://kiptep.ru/file/bapabagisajazawater.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
- http://matrix-corporation.com/upfiles/editor/files/tevofepif.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/33378000407.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a141656b84---rawup.pdfIn PDF document text
- https://marathonroller.com/userfiles/files/pokol.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdb999e04---fuwapoxavud.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_off0000bd89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD89	10324 bytes
SHA-256: `2a35db2cbef73d379cdb780c70654b68c1e7c629054d508de63282afb989952f`
`font_01_sfnt_off0000d4c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ecda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECDA	17040 bytes
SHA-256: `2783f70516e673dc4b1ea5f36afe6f002ab4c4f4536422a15c11ea1b621961ea`

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