PDF malware analysis — malicious · 6c614c7d75dbef98

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 04:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 636e99b96435f14eb20d5c5be116c438 SHA-1: 0d21a29ab733d55d0c9ee69d45a8dd82f92dd73b SHA-256: 6c614c7d75dbef98a229adaed4012893cbb41b4d4913906f1fa9b9cc486c3941

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://servis-hradec.cz/files/file/31595914564.pdf In PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ahv9mrjjldc52oqfvfqugke3ih/44706863231.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4344839d802561cf09718275dcb22b7/20403749095.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ce9db094---97036005865.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffeb79340---85939371852.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/siwil.pdfIn PDF document text
- http://orderkai.com/uploads/files/55518076671.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e22c193dfeaf9fa8834206dcc5f1f12f/mojifiwumid.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fecebb4da7---zejabaguvazuxuparidu.pdfIn PDF document text
- https://bnbtravels.com/ckfinder/userfiles/files/gimeziwadezapoxivulelim.pdfIn PDF document text
- http://dogable.de/userfiles/file/67856549521.pdfIn PDF document text
- https://midasspa.com/ckfinder/userfiles/files/suwowonajonike.pdfIn PDF document text
- http://novichiha.ru/pic/file/duwarabibigagus.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17546523173.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee76256cb---73019349598.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b39bc0e820a09c071cfa666eaf879dfd/30737989630.pdfIn PDF document text
- https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/49tgd15612kkjkvjm2sla6k9i2/64288766632.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070cd2366612---33209989197.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224058bb2c---kamoxazukoxazaxumidoko.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098636c5c74d---56819711066.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160764193a9ac5---manugejakotesube.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608354328446d---26308263623.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/61165004552.pdfIn PDF document text
- http://hillandcunnreunion.com/clients/864369/File/68623174976.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3a9b55eb---getuwuzaxuxegulomigiden.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f223e1ab57---47685861921.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c4e9076b---4513647082.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e98edc5f---59572314335.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+as+system+photo+library+grayed+outPDF 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_off0000f642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF642	17600 bytes
SHA-256: `977f8ab1d3194a155cca4cb1a1c248cf4a77a8cbf469b72082698c9639b555e9`
`font_01_sfnt_off0001245d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013c74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C74	11096 bytes
SHA-256: `bd30d05ccb5fe4766b504843a2d7a272a8d7f9a04aaa0265f73cc9c94248b0ab`

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