PDF malware analysis — malicious · 784b66e054f5c820

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 10:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6ed4aee2b96a7fc9a54be195f6cc6b2d SHA-1: 1e847a52706ef64788e4d3f9c131d0587a875d4a SHA-256: 784b66e054f5c820383ba6a41a378caa07b7dd7d08c6c259ea5b84419d4a2546

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=2012+road+king+for+sale PDF link annotation
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910cf3a76b---84147217990.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r6mnjrs80o4pl2vicvjo6lglv2/39285811907.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093b709c1b50---deditixiteribisetumelu.pdfIn PDF document text
- http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/34700959126.pdfIn PDF document text
- http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/ruxuvapokonuveb.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7cf12a26---88102929329.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/55461898356.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/kuxipigejopumevewev.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b99dc223e---xidexoke.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6880388a5c5f64e77a73f4d5d1f48164/jexijanukajoba.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979701833c5---jubugavufusesomerezorened.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c3b312818f066f44f93fe1e356929024/67266288505.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1e812ffce75ff31d5763ad735f0f4c9b/4779994775.pdfIn PDF document text
- https://globalybm.com/ckfinder/userfiles/files/1625871573.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc244cc7d---12926537440.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/difaxegor.pdfIn PDF document text
- http://oilandgaswork.com/userfiles/file/60286540745.pdfIn PDF document text
- http://51www.org/uploadfile/file/8daf627adbad38a5d9ba03e1ba81e1f8.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4c2203c3---30191946819.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/538vs5ohm38japvusmvr9fk8e7/gafaki.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a8556fe19a9---kuravowulibeja.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072995bee9b4---seridoza.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/t6hdmuq5ogji1r9i3e3uaong11/kepusuliritojepotakizola.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_off0000eb8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB8B	10720 bytes
SHA-256: `bde3e12054eb5f4b11657fda52983047486a3d03a1d95e03d3dc07240a27add9`
`font_01_sfnt_off00010414.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10414	17748 bytes
SHA-256: `c3077394d17d255599cc0d00ac56e50b71b6051b59f0c32b08e7873991b7db90`
`font_02_sfnt_off00013288.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13288	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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