PDF malware analysis — malicious · b2bb7ecd32996057

MALICIOUS

PDF

85.9 KB Created: 2021-08-19 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 346dcf4a0bb47247d91321388a2c9582 SHA-1: 6f3d6f35e96b8633c1ea1399a373978dbde5ac6c SHA-256: b2bb7ecd329960573578a2324e5779ed7c0e1041c3c7ea30bbd987ccf578877e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, combined with the link farm, indicates the PDF is likely used to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e2028cc11cee2859f197fe48ae395d9c/23423223936.pdf In PDF document text
- https://rowanmkt.com/Uploads/ckfinder/userfiles/files/25872470057.pdfIn PDF document text
- https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/tijurekujudajonubeweru.pdfIn PDF document text
- http://rezidencianestor.sk/app/webroot/files/ckeditor/files/borefaxikukebujutuzewob.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/16655890922.pdfIn PDF document text
- https://123natura.com/stockages/files/46810637035.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/nutrgm13c502aq28s92rg4kr3j/22556870764.pdfIn PDF document text
- http://ecogestval.com/userfiles/file/kimisipirujexigerod.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/jakiwanudekutuwupenedu.pdfIn PDF document text
- http://thaimassagemodel.com/ckfinder/userfiles/files/gazekimewadiwoderagurafab.pdfIn PDF document text
- https://transport-vehicules.fr/userfiles/file/tavureletepinosizeg.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/855028a53b9a5527c2015176da44e58a/volajejetiga.pdfIn PDF document text
- https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/5459223842.pdfIn PDF document text
- http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/mudezovaf.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba80d053c7---50650721103.pdfIn PDF document text
- http://elrey-uslugi.ru/media/file/tetadekepavajomamofabuv.pdfIn PDF document text
- http://psycare-spb.com/userfiles/file/debilozodogagojarujez.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/5955866660.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/75855533408.pdfIn PDF document text
- https://economiadecomunion.net/ckfinder/userfiles/files/91781755493.pdfIn PDF document text
- http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/wotuganibegu.pdfIn PDF document text
- http://hciclerp.com/asset/uploads/files/82318721205.pdfIn PDF document text
- http://cablexconsulting.com/Upload/file/tupofovitebuvafeg.pdfIn PDF document text
- http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/bifoji.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161093cfd0bd68---57867961225.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=call+of+duty+black+ops+2+multiplayer+online+crackPDF 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_off0000e5dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5DD	11380 bytes
SHA-256: `cea315a5cc1b7de209db46d605e7c9d808da9b149a3a71ff66df83b6cc07742d`
`font_01_sfnt_off00010098.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10098	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000118aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118AA	18320 bytes
SHA-256: `001f04cf519d215dab9d07f304f9d8ae95a77e05d21c71cb70034c273a3dfc64`

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