PDF malware analysis — malicious · 3867861369a4e124

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 00:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d10999d23268b3a391cd4dc4a409c15a SHA-1: 1988738300802ced87b62adc2c8af7fbddc086ef SHA-256: 3867861369a4e12426b745c3d29cb8773488db149e91c04a95a5857dc2c69757

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack delivered via attachment. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest a phishing or redirection scheme.

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/45dfafeb274b6398b801579f067ee1a5/jelimapefifazu.pdf In PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2fc7119a0aadfb3a09b518f6c55467c1/dibinijoxelulolisamu.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/54688848824.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f9a85md2ubqruooc6009tqb66m/pajopurav.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc76df1d720---13908394301.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e77db105---98450848152.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090a21a822b1---12504697157.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b72424c81---38987459965.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/11141229329.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608620929ae73---80486446329.pdfIn PDF document text
- http://riggi.ru/userfiles/file/munerarumuwetobidi.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0a16cda438d13789d449fcbf6b11e27a/85300894690.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/cd7a55f69419a335bebbbf0653d27332/56171904359.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b361b9434dc76647ead778ce59d9f3d/dojedetuxi.pdfIn PDF document text
- http://villa-carlshorst.de/sites/default/files/file/ribajozegabimugovomafemet.pdfIn PDF document text
- https://greenlakepaint.com/ckfinder/userfiles/files/60966517467.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/74377135562.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dd5636fc22dae996d641b6f1a93b9d20/80823489148.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35b36f06f2ca9948d50aaadf14a5d1cc/20308833100.pdfIn PDF document text
- http://www.bandungmesin.com/file/83914494985.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f809ae802---74337042830.pdfIn PDF document text
- https://giorgiosantinelli.it/file/17626321681.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a502e505520---lakojuziwulurusetusuxum.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gdr7tggclh7357dmbh90otcqls/21213200467.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7c2acec0---71806118549.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e2e6174eb62f1d95eeb3095c96df5f7/xiruwurow.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=top+shipyards+in+the+worldPDF 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_off0000ef86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF86	10652 bytes
SHA-256: `50f19c0ca89c96820ff6f821cc60ea359ad90b02e2a30b52ed884814980f192e`
`font_01_sfnt_off000107f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107F5	17864 bytes
SHA-256: `7f143cf670aaf5152f0d5c0fc12703dd09331f98a111c899c612e16b010f0286`
`font_02_sfnt_off000136e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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