PDF malware analysis — malicious · bc3b255dfdd3aa17

MALICIOUS

PDF

80.7 KB Created: 2021-10-09 10:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 1435c32c1230d80f4fb69fad112ca493 SHA-1: 0b4b22dd31e3e277a37d18f2311b35bca05712e7 SHA-256: bc3b255dfdd3aa17f36aec5370ea2027ed7bd30fe32001f5b6e53862225d99be

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://bloomlight.pl/_bloom/file/97660309482.pdf In PDF document text
- http://abwalabamaave.com/uploads/files/nafudisokunekozuxinur.pdfIn PDF document text
- https://feng-shuiworld.com/userfiles/file/beginolexav.pdfIn PDF document text
- http://musclecar-taps.com/js/upload/files/givejowejinazanojowinin.pdfIn PDF document text
- http://crediramasrl.it/public/file/69965548043.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70d2c6f62---12836345489.pdfIn PDF document text
- http://dainindo.com/Uploads/userfiles/files/17612586156.pdfIn PDF document text
- https://okazionche.com/files/bixob.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/4876317174.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8ab4b4ce2---97183336532.pdfIn PDF document text
- https://yar-net.ru/userfiles/file/85692265727.pdfIn PDF document text
- https://performanshost.com/calisma2/files/uploads/tarobizafore.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0acc80e15---ponegadopinipa.pdfIn PDF document text
- http://ylplj.com/ckfinder/userfiles/files/tukemifunejesinozapoz.pdfIn PDF document text
- http://royalrep.com/userfiles/files/fewipopaxalos.pdfIn PDF document text
- https://pharma-tools.pl/galeria/file/venefesasajewan.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smfiavi5na442gi7ifj5qbv0ut/xutolepeniripifetavuzuma.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/bobalipomusix.pdfIn PDF document text
- https://machnik.net/ckfinder/userfiles/files/43203195576.pdfIn PDF document text
- http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/26913004871.pdfIn PDF document text
- http://popnmusic.fr/userfiles/file/nomugetikom.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/poragovusojerefolikuje.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e52c45ba10261b92b0584e583b47ea83/zurok.pdfIn PDF document text
- https://www.padanguparduotuve.lt/ckfinder/userfiles/files/nifukafe.pdfIn PDF document text
- https://kaktutzhit.by/uploads/files/sopopopurezogirafuriv.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+tooth+doctorPDF 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_off0000d7aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7AA	9860 bytes
SHA-256: `c0631249c6e25bf2f3d28258ba9edb34e7d3910118434fca838ad77f575d0b23`
`font_01_sfnt_off0000ed78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED78	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001058a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1058A	17972 bytes
SHA-256: `62a7ad0e128b7fa43b7e8730b72362cc890570547c2178ead65828b445a7dca5`

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