PDF malware analysis — malicious · fd14f21d91105612

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 16:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 2e2d8a0a83805442e5676f927e075853 SHA-1: b14c1dab5910425f26c548e08e13266ff1f915d8 SHA-256: fd14f21d911056120d2abaf3e74959e535f738e2ff95bf114750e70b0c7a3b62

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting. This indicates the PDF is likely a lure to redirect users to malicious content, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://huntic.ru/uplcv?utm_term=android+proguard+obfuscation+example PDF link annotation
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b0d68b45dc00a3b12015af66fc32edcb/3214078932.pdfIn PDF document text
- https://aedwea.com/upload/foto/21244042370.pdfIn PDF document text
- http://opusbiz.kr/data/editor/file/19268889786133b18d45aef.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/588dd63dbce43b12d3e67443e115d50d/81017924866.pdfIn PDF document text
- http://missteenqueenuk.com/userfiles/file/54072523044.pdfIn PDF document text
- https://envirotechindia.net/admin/userfiles/file/sifikes.pdfIn PDF document text
- http://flemingdecal.com/uploads/assets/file/xonulivowunise.pdfIn PDF document text
- http://studioagronomoserragiotto.eu/userfiles/files/fevuxipurojakigul.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/34d60855a2c5cc4adb1ba38e4cc4f270/11772617789.pdfIn PDF document text
- http://etyekilovarda.hu/userfiles/file/bafogixedasulato.pdfIn PDF document text
- http://bndweb.nl/upload/files/49088071258.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d0448a4d1ff1d38206d6fd71b6d6dec/41482270094.pdfIn PDF document text
- http://clubmaniacr.com/campannas/file/12502115866.pdfIn PDF document text
- https://hkfew.org.hk/ckfinder/userfiles/files/gizakixoji.pdfIn PDF document text
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zoraxaborugis.pdfIn PDF document text
- http://studio-orlandini.com/userfiles/files/bosibudoj.pdfIn PDF document text
- http://gasasosong.com/upload/fckeditor/file/jisiwuxozojomefuf.pdfIn PDF document text
- http://suamayphotocopy.net/userfiles/file/pofusawamipokanafotab.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/tuviratokijamexizujopuf.pdfIn PDF document text
- http://z500.si/files/81638672900.pdfIn PDF document text
- http://andreuma.madteam.net/ckfinder/userfiles/files/gonaworekopujorasike.pdfIn PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76020942965.pdfIn PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/xusodutin.pdfIn PDF document text
- http://fireprovietnam.net/luutru/files/jofitojibupafot.pdfIn PDF document text
- http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/litapevejosididajut.pdfIn PDF document text
- http://hoanggiaphatstone.com/upload/files/3312800387.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_off0000db39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f350.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF350	11284 bytes
SHA-256: `8303c3f013c8b5e61a4c6fdf989065b5db56a90f47f9c7d37608e902ab77cedf`
`font_02_sfnt_off00010d70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D70	17488 bytes
SHA-256: `a2b80a9cdb05642fc9f728646605101eb9f5ce5cdb642c1c272b01db6e83ff38`

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