PDF malware analysis — malicious · 76ca460b88778a5e

MALICIOUS

PDF

80.0 KB Created: 2021-07-05 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b2d81333068e72a22222a8c1a37ed427 SHA-1: 35a97bda7ec53112794034ea593b2c75077575bb SHA-256: 76ca460b88778a5ef2d9d5db15b6c387f9a42759b5ce965c7c4beea05d8d7590

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with techniques used to distribute malware or facilitate phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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 https://infrive.ru/uplcv?utm_term=what+a+beautiful+name+chords+key+of+c PDF link annotation
- http://drshapard.com/clients/73598/File/befujamaxuje.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88def07ab---4021130006.pdfIn PDF document text
- http://aisef.org/uploads/userfiles/file/file/34675822454.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f146a2fc1f4aef30f978f5ce24edb037/55254238099.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1a96fe3e---rodatisuzonugedoro.pdfIn PDF document text
- https://alshuka.ps/ckfinder/userfiles/files/tijifipofirivufeletukax.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/16f2b5b81a62c13d162fcdc827dba9be/60350007806.pdfIn PDF document text
- https://service-panev.com/userfiles/xibekemixige.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58c42e83a---bepijilasamamobiriwebebe.pdfIn PDF document text
- http://ldbell1965.net/clients/85689/File/5112266598.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/574ab6d7572d3d6e117a6653397b7719/87174954996.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d717d1ac---84359053316.pdfIn PDF document text
- http://ontsgoi.shop/uploads/files/pitasibubavakefazoxipodow.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd70a2824---pisukaduz.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/54f3344f2518d57c611d8b1c7dfbff0b/59280370543.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/01628a00d7038e322ac1a26a94fd12c6/nokofilabusugex.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb99baf22---bevepogi.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f81c93890c5a40fc85e68877a7e919d/niwisamuwavab.pdfIn PDF document text
- http://bielwod.com/userfiles/file/kazasukupo.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/539d706cbcaee4324122d7c2ce6e237c/kavatik.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bb609489---daretafavamunapis.pdfIn PDF document text
- http://irinka.org/ckfinder/userfiles/files/welutavezedaberovaku.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/df06fc8884206ffc06368290c7a12cb7/33783167140.pdfIn PDF document text
- https://centrorevisionimonregalese.it/file/12752730214.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/lezovepidow.pdfIn PDF document text
- 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_off0000d29e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD29E	16820 bytes
SHA-256: `ac22cb3cadb17cfe24e590fe236e9758dca59e45585506c6b86b3f3209a64ae7`
`font_01_sfnt_off0000fee0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEE0	11180 bytes
SHA-256: `b9b18f6d11c4666bf119bd4e33e0ed95f66b93ab9c7d0801d6fb1db0099fdca3`
`font_02_sfnt_off000118da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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