PDF malware analysis — malicious · 09738fb7581ec950

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 12:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 969f4b1ee306a945b593fb9df1cf4f40 SHA-1: 92d42a288a79469989ba34ba5f2de2cfe9589354 SHA-256: 09738fb7581ec950b6b9526d470440dbac4fbd4aeb4226b464a8f6c3ddd3a21d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm that points to numerous compromised WordPress sites, likely serving as a lure to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to exploit users through deceptive links, aligning with phishing and potential malware delivery tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9881

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://krisoc.ru/uplcv?utm_term=how+to+add+a+new+chromecast PDF link annotation
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f8dbb131---petepikoso.pdfIn PDF document text
- http://golden-candies.ru/webroot/files/files/xuwiguwaf.pdfIn PDF document text
- https://samngaimarble.com/html_upload/file/1744654518.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4daf74c33edfe4de8ef24c3ddb04cca3/90390363383.pdfIn PDF document text
- https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a9ed290aa758202bac66db7642ca7681/zuluwixod.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23b88d334---fabej.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dd5b2b2fd11999d59bf5fd5fef6650bd/davijefezevujuzamomi.pdfIn PDF document text
- https://cometsecurity.in/admin/userfiles/file/puveperekadizofijem.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/dagigawaxamafeguseka.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2baaeec8d5---11897870331.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pbhajqbm0oe7kg6k88dproisiu/82643155858.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079d74617382---33893179115.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ca077376f---xepumekapikude.pdfIn PDF document text
- https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7f72bde3d7e6ff9f7eea17beb23f1164/52431397575.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4jch64f02mr712udh7o96ektid/vatofupobagisogirojonogom.pdfIn PDF document text
- http://sushigonewildtogo.com/uploads/files/39716913838.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584847d2ef---83663277729.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/103bd17cd188a37a8c54721e070a84ef/debotogi.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4ff50fee---76734921210.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5ehf36u8ppbm47eoi1a3h8loe3/lujilugaxirotul.pdfIn PDF document text
- http://land89.com/ckupload/files/2705547286.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/jfameb3q7pkvln0v7qse5vde8n/75236827222.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607998483f3aa---virerukigezorano.pdfIn PDF document text
- http://angelescare.com/userfiles/file/dojigujusuzobawenewevotox.pdfIn PDF document text
- http://jandenzobv.com/image_uploads/file/golobasolebubur.pdfIn PDF document text
- https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db025623f831f8372210d640d301473f/tibiwojepipefudiledew.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_off0000ef5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010776.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10776	10572 bytes
SHA-256: `04d41a4d18e24bff5dc394f6dc992c1bab3eec1315c8999cd17077fb1fcb0bb2`
`font_02_sfnt_off00011f67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F67	17364 bytes
SHA-256: `77e81b48909a869cec4bbc1ce3085c7074b48a8070984aaba690b0112a51b840`

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