PDF malware analysis — malicious · e74bd127d3fae489

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 01:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cf780f3392dd2d45214449bfb494871e SHA-1: d0b88bb72abdc6d8333cfc39f0ed76ee1b34bd5d SHA-256: e74bd127d3fae4891ef8a978448d8ef7bc8122fa68e66782e282d6ca747224b7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Multiple heuristics indicate the PDF acts as a link farm, directing users to various external URLs, many of which are hosted on compromised WordPress sites or disposable domains. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as phishing-related.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 http://entiambalaj.com/upload/file/6224883163.pdf In PDF document text
- http://hoteldanang.com/uploads/images/files/tunigevovotubarov.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cfb26b3d7---xixugojovenove.pdfIn PDF document text
- http://hanhthien.net/uploads/file/5298589430.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/gizenomojefuwo.pdfIn PDF document text
- http://puzynowska-kancelaria.com/userfiles/file/ponalos.pdfIn PDF document text
- http://novehorizonty.sk/userfiles/file/31654474614.pdfIn PDF document text
- http://esoftland.com/userfiles/file/nevokezubiv.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/jetujuximigodixup.pdfIn PDF document text
- http://ahrestygz.com/userfiles/files/20210814_040408.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/31663052389.pdfIn PDF document text
- https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jazamebaruxebatimarimev.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/52623544144.pdfIn PDF document text
- http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/abb3bb07ab090394307000534b60903f/90040277259.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a19beb7c65ffc670e7e24e73d6c50ee/jugarot.pdfIn PDF document text
- https://0900107678.com/upload/file/famisidarilagor.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cbbd9715fc367cb7ba67fd56b9fe569d/84697666566.pdfIn PDF document text
- http://getampedmag.com/ckfinder/userfiles/files/28355242442.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df864ebfd6d---zudix.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33018e61---30508376290.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cf4b3597---fibizoram.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a063c06f177---10309725224.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b8d1aec6cb1bdceb320e3b79c9afc7f8/25276145526.pdfIn PDF document text
- http://bugskin.org/userfiles/file/pezemurefifotopalejifov.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/pekuxefujon.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/43918466182.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/540a3e6c82645e77cafc071552be5c34/50333974112.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tecalemit+3000x+hoist+manualPDF 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_off0000e3aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3AA	10856 bytes
SHA-256: `a56b2b780f8d8cae2f76315cf9d7c2e6cf2454aee691121ffd05c2fd96d54c7e`
`font_01_sfnt_off0000fca3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000114b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114B5	18528 bytes
SHA-256: `072a6bd41b69ee39c0113b3d4661e86d9dcf84b9f310e06fff4a1b492a7a5828`

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