PDF malware analysis — malicious · e1be65668034f753

MALICIOUS

PDF

63.7 KB Created: 2021-09-20 05:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 30964e4a01a9f5d490ba44aa474bd711 SHA-1: df92e726573ca09e33909237cf4894bcd892050c SHA-256: e1be65668034f7539c80a2fed94062e32e6b47e0f9e993fb4a946aab265b8a6d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern appears to be redirecting users through a series of links, likely to a phishing page or to download a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.5809

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.
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
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://praktijk.zorglink.nl/ckfinder/userfiles/files/dagubo.pdf In PDF document text
- http://gillsandgeckos.com/userfiles/file/rimesa.pdfIn PDF document text
- https://ckv-siemreap.org/ckfinder/userfiles/files/89844839447.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4e3d21b96dbb5286f60e4ea879b0f56a/vugepebojal.pdfIn PDF document text
- https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/50536991946.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300e4ed2e---63017981714.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ee10edea5ae42a0008fd6c0281ee0356/95592157077.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/776f3e993ee1689fd453231773cd6681/javapupesezujazosonekesu.pdfIn PDF document text
- https://marblobaths.ph/app/webroot/img/files/sepodotulokuko.pdfIn PDF document text
- http://ikra-ekb.ru/files/fckeditor/file/borevawosoxo.pdfIn PDF document text
- https://sadhankendra.org/erc/media/vowikazajuboxivuputedemo.pdfIn PDF document text
- http://cwesp.biz/upload/file/wulokubazozinu.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d52f5a8f6---66807688728.pdfIn PDF document text
- http://toyotaprius-custom.com/js/upload/files/80886151700.pdfIn PDF document text
- http://www.chp.pl/ckfinder/userfiles/files/jemafit.pdfIn PDF document text
- http://adhunikjewellers.com/ckfinder/userfiles/files/nukadikekoteveb.pdfIn PDF document text
- http://dirpub.org/editor/ckfinder/userfiles/files/93263983048.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fe5dfbde86c8f871848d7468ed38956e/35281312563.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/87292706146.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/caavu8htlun8be2tuq5qk2c5kp/76084641782.pdfIn PDF document text
- http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/sixivinog.pdfIn PDF document text
- http://quetthe.com/upload/files/57572771405.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c85de80a73b77873d47ecb93ac227f65/viwufupigemi.pdfIn PDF document text
- http://tdvvietnam.vn/webroot/img/files/kegesitezazolura.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wifi+hack+for+android+10PDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b54a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB54A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD5C	15220 bytes
SHA-256: `d211b2fdaec2801d9ffc017c76c872674067030cf6b41f7446ec141138f75a5b`

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