PDF malware analysis — malicious · f9fef8e4018f82e7

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 08:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a367155bdf4494452d4999f960ad5e90 SHA-1: f62f3c459e52e9e573d36b4c103615ba3574973c SHA-256: f9fef8e4018f82e7ad7a18546d8561cd14ab99cc2a53adc93636bffde8f69be4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting it's used for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised WordPress sites reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://lavalnerina.it/userfiles/file/dalopexorolejububetidaxer.pdf In PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fd0d4ca286019de1b6a0671518c55cef/13816820676.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/vuderuvuludusasizazawew.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/5459317234.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6e180ab1---muwabizimanafezanogajot.pdfIn PDF document text
- https://floridainvestment.cz/files/file/ripufaborix.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/78458260757.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8c152b878184ccdbc021cb1d8f8589a7/fekafoguwasu.pdfIn PDF document text
- http://olympiad-bigben.ru/ckfinder/userfiles/files/71488600815.pdfIn PDF document text
- https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/xolunusewezidetesibeta.pdfIn PDF document text
- https://perfecthospitals.org/ckfinder/userfiles/files/16976822585.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68020188a7---88641397780.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092569cea0f3---bobegogezere.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e38d6cbd790148eed30575c4b3a75d5/67611044326.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb770c83---kebeluzurazibe.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121356db8af6---27300045984.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/4558390914.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/50394486290.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/aaba7c58613656cccb5d4a84953e20a6/najalo.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8g5m36sic0h326vjhgutugas61/negubunetujenovo.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad918562074---lufomikibawinexofow.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/935b1427a4dacdb155c90b7b53683884/vagiravixavigivevape.pdfIn PDF document text
- https://lawrenceyezersky.com/userfiles/file/digox.pdfIn PDF document text
- http://kerama.altrodesign.eu/ckfinder/userfiles/files/15218048641.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+man+in+the+high+castle+pdfPDF 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_off0000c29a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC29A	10808 bytes
SHA-256: `bc1481dfb5997bfb7051060caa08b7de1ba2fea1ea8561f20f9ffd2235c0d42f`
`font_01_sfnt_off0000db18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB18	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f32a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32A	16484 bytes
SHA-256: `a8fd5bc8c8a9025e73a4ee8fea30aa37cb3bc33b132080bb161b1ab2d07ff080`

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