PDF malware analysis — malicious · 57ad5301370aa98e

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 15:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 99421b2973e9b5e7e5881aa856a81733 SHA-1: ca5598078d5535396a818e90333fc7f009ad7503 SHA-256: 57ad5301370aa98e913c77654d833616265e6a078c9c56fcb0702497e0f0084c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The embedded URLs, such as http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae283fccc---nudexirilitopiwuj.pdf, are likely part of this malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://quimicahj.com/admin/userfiles/userfiles/file/33260282724.pdf In PDF document text
- http://slxiang.com/v15/Upload/file/2021971659161342.pdfIn PDF document text
- http://architettobotteonpierpaolostudioabacus.it/userfiles/files/zuxukaxegasadimazu.pdfIn PDF document text
- https://iwistw.com/upload/files/69289295177.pdfIn PDF document text
- https://airxps.com/userfiles/files/jikamawan.pdfIn PDF document text
- https://wolfgang-photography.com/userfiles/files/vijefuduxuwelipen.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d33cd9b6a4b533b85efbe2fcd29cd475/sugujujupid.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae283fccc---nudexirilitopiwuj.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/nhbk24uebq2oce3qhiig7uj9mf/lipujeveji.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2d82877983926532e3ac09cad230c00b/zevasikazokawadoxasoj.pdfIn PDF document text
- https://holcom-wd.holcom.vn/webroot/img/files/gotogoxerupusub.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/midadesesum.pdfIn PDF document text
- https://ags-car.com/upload/files/93026715220.pdfIn PDF document text
- http://rileyillustration.com/images/agency/files/80283135581.pdfIn PDF document text
- http://ms-beauty.com/ckfinder/userfiles/files/zaxiwovapetasutofazo.pdfIn PDF document text
- http://superfasttv.com/uploads/files/49180672489.pdfIn PDF document text
- https://cuatudongsaigon.net/uploads/files/suzegadefaxodarep.pdfIn PDF document text
- http://stin-verdon.fr/assets/Image/files/61551244544.pdfIn PDF document text
- https://aradovan.com/userfiles/file/71810816291.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/golopawi.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mh5g9v0v0vcc8867iuusnpojh3/zibimigigakaxu.pdfIn PDF document text
- https://rent-1.es/ckfinder/userfiles/files/zoginakitekegixovev.pdfIn PDF document text
- http://elliptical-trainers.ru/ckfinder/userfiles/files/neralekakeju.pdfIn PDF document text
- http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
- http://marcth.pl/media/fck/file/bupat.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=du+recorder+voice+changer+appPDF 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_off0000deb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6CC	10648 bytes
SHA-256: `041d7625434aa8fada6c1188f0c929bc7e8aeebfeac5bbe74117d20fbbd13e53`
`font_02_sfnt_off00010ee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EE1	16804 bytes
SHA-256: `8441405b719c0d425fcc1f4563d4345c70b1ed641f5c6ce133fa716ffe4ec94d`

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