PDF malware analysis — malicious · 3154073007ffd4f3

MALICIOUS

PDF

89.5 KB Created: 2021-08-15 16:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 017ddc2a0bdb43faeb468e964b4fced1 SHA-1: 8f36691d8328d565590ceece9c1ec6a118681922 SHA-256: 3154073007ffd4f39489b822db0701bcb28e0acb10d7dfeebff354981596095a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://asclyziarskyklub.sk/userfiles/file/wepoxuvikizasipoleg.pdf In PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae1d19003194975dacfa6403a83f920/36458747177.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/35955057042.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aba7e5caf3824cb4c69c952863ffdb19/68870648945.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b9cca7a5---siwomitazixuzebilutot.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/1518226965.pdfIn PDF document text
- http://omeofest.eu/userfiles/files/zijusepibidida.pdfIn PDF document text
- http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/siroxo.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a573166eb8---gatazopipepojasare.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j6eion6ue37ejohi83r5u086pg/70061795984.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b20e0c5a8f746a322388fdec26b6b035/70747005583.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16113a2cf21167---moxig.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b7531244e---pupegivapigiziwedujiti.pdfIn PDF document text
- http://splogservice.ru/content/file/zerikuvus.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/96fb6bcbe4956fd714a554ed61a6b1df/94897909238.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/475ffacc93007360d05106ca171c38e1/kipimefazudavonukaxupenu.pdfIn PDF document text
- http://farmaciafoglia.eu/userfiles/files/2453077082.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609858878466a---jizova.pdfIn PDF document text
- http://wsp.pl/userfiles/file/xepuf.pdfIn PDF document text
- https://ketex.com/trcgp/ckfinder/userfiles/files/9625374694.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079a1266652b---18858084068.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902b265837a---koraberanevuletobamideda.pdfIn PDF document text
- https://zlatartopalovic.rs//files/lorevigufefot.pdfIn PDF document text
- http://reklama-v-sochi.com/ckfinder/userfiles/files/susisepumokolobasawasipi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=1v1.lol+-+online+building+and+shooting+simulator+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD49	11292 bytes
SHA-256: `f4f1c9117a558c299b1965c8abe4e9b7e86ab33717a6edfcce40be3ccdb9e78c`
`font_01_sfnt_off0000f73e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF73E	17724 bytes
SHA-256: `64a0bbd2e55cb8b058a9636c83f91ef6f744af759c9a70a5617713de0de6ef22`
`font_02_sfnt_off0001247b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1247B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013c8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C8C	17308 bytes
SHA-256: `314380e652f7121dd3962c441057605396e389f94e3b00126dee32c89bc96ca2`

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