PDF malware analysis — malicious · 4254269aec7c4440

MALICIOUS

PDF

111.3 KB Created: 2021-09-08 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 913e66722a239d27b9342b324561417d SHA-1: 3e2df92594ae1ce9a0af1e0d8b35778b33581bd5 SHA-256: 4254269aec7c4440b70b5582c3a8bd10dd10e985e9f52773bc10eafdd368ba49

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf52efbec---ferigodatesonogifoj.pdf In PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c43c3952---49649581979.pdfIn PDF document text
- http://garage-ys.info/js/upload/files/ginegofodakosinujan.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee9e6b6025f1cac1265189f044c25469/74561236843.pdfIn PDF document text
- http://gramercy-grand.ru/files/file/tudij.pdfIn PDF document text
- http://architettoletiziamasciotta.eu/userfiles/files/95685610326.pdfIn PDF document text
- https://tonitomov.com/picture/file/46201644655.pdfIn PDF document text
- http://hiroi-es.info/yamituki-n/uploads/files/dotavoselosokel.pdfIn PDF document text
- https://nepalaviationmuseum.com/userfiles/files/26844445043.pdfIn PDF document text
- http://sun-green.be/ckfinder/userfiles/files/jijanizilovapatew.pdfIn PDF document text
- http://joinsocialbubble.com/cake/beta/userfiles/file/39959918622.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/zaresagiwugudavomasalo.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d554b1a07---79821655518.pdfIn PDF document text
- http://gewoongroen.eu/app/webroot/files/userfiles/files/peseralif.pdfIn PDF document text
- https://annjulieskarpmo.com/userfiles/file/15477812338.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af40b3efd76---54490711578.pdfIn PDF document text
- http://laiyi-art.com/userfiles/file/wutob.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f40ea0ff1---tatifafiteg.pdfIn PDF document text
- http://uppercanadatwocylinderclub.com/clients/877835/File/devilel.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4411e722---jesurojiv.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/761882c9d3ababce15c3b698c08162a2/jekebezusex.pdfIn PDF document text
- http://anoh.net/pds/userfiles/files/58704361151.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/97051784c4b3a390302f4712d91998f0/88844455461.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84689e555---genefanunerugosafon.pdfIn PDF document text
- http://dlzj.net/upload/files/20210530201448113142.pdfIn PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/salimagenitowuwofabedosub.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a4c24ddd129b82b5c7e32568858cbad/kadadeg.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ba2d816aba5fabb21287b97913208fa1/30476450721.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=positive+relationships+worksheetsPDF 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_off00014be7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BE7	19560 bytes
SHA-256: `a3ab5bd211ab1e14a51185247ebd2eb44b3c8786ca1c676b4c4c0bf8f4c2d4e3`
`font_01_sfnt_off00017e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17E43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001965a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1965A	10592 bytes
SHA-256: `d821fc306a4d92fcb0d7a45e3613d80be0ce1919ebba9f559c226a9f3d0b6ee3`

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