PDF malware analysis — malicious · 91d744307d7e9638

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 09:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 0e10bb0db2839e577736f40e5a8e5e2c SHA-1: c31205027e578d1053040fad44c48ae4c82d5c61 SHA-256: 91d744307d7e963892a9d6fe02b37895cbf93f881ccf4841bc6587ab6874268c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links appear to be part of a link farm designed to obscure the ultimate destination and potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ebf65006---pulajamadejifibeviwij.pdf In PDF document text
- https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084faf7a065b---50914129228.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9867476c3---rudasageneturesox.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a115b23576d---tuxiloj.pdfIn PDF document text
- https://askisan.com/upload/ckfinder/files/dofoxogaxukop.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a0f369270---27221591717.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/to99bhleh00pe3elvnr46fdl3n/zusejizufirurobetolozu.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6f0117ed169735ebd11eff9b728887ce/9549229127.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d852cae7c22078681fbed0398ca25a0/rejojalik.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098333ae42eb---34881024784.pdfIn PDF document text
- http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/wosuzimapebufil.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec59d98f5e---tumir.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abe8d7eb2---pojuka.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/29099865480.pdfIn PDF document text
- http://galgalesh.com/userfiles/file/sojigo.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcf569065---76159142583.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2503e4e550a1565048a9f83b753c26a3/1197521758.pdfIn PDF document text
- http://scro.ru/pic/file/wokideb.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6c298eb7a1adca620d8f7dea042e65b0/zejuxevonosixako.pdfIn PDF document text
- https://standardpromotion.com/images/upload/userfiles/files/35143971140.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g8l2dttvhq86uufidkncml026d/norir.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f0924f72---21619661474.pdfIn PDF document text
- http://taxilitomerice.cz/ckfinder/userfiles/files/28807980530.pdfIn PDF document text
- http://yuha.be/_files/file/86983436764.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b697596423---jumadogimatediwadamekasaz.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/buvirunizoxeto.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0ab175afc28045af43c87da4f6a432d6/lotajimufisopiko.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jacked+up+chevyPDF 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_off0000f16f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF16F	10244 bytes
SHA-256: `e843f0a8a56e3c9a16d3d586f413d99a8c507e6e0e6dee81c643faabba87db0a`
`font_01_sfnt_off0001089e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1089E	17364 bytes
SHA-256: `d5efae998cf92ebfea44c3cd404ca236860572082e5e185664419a1d100748b4`
`font_02_sfnt_off00013610.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13610	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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