PDF malware analysis — malicious · b14bf32ee3cad6be

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 01:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4a73fbd31968dbf5ffca4542de34c1d6 SHA-1: ab54e2b2ef7b81f177f3e7890e5637db3c58936e SHA-256: b14bf32ee3cad6be174433a98c57674a6673d40f923b553623a6453ab7230aa1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The PDF structure itself appears to be a link farm, a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://aven.su/userfiles/file/85449662612.pdf In PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e18292995b4---56452347169.pdfIn PDF document text
- http://fairbank-ia.org/admin/ckfinder/userfiles/files/xidogezilemarowoleme.pdfIn PDF document text
- http://axwelindia.com/uploads/nijigepesovived.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/17070610631.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/525de0ea94cc069bf3e71d584546034d/joludawiveradu.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbccbc7819---puwikipederekijafok.pdfIn PDF document text
- https://quaint-house.com/images/blog//file/13655610600.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16102cc7ca8089---mejosumususilig.pdfIn PDF document text
- https://namlongadc.vn/uploads/news/files/fofez.pdfIn PDF document text
- http://dijladentalcenter-qa.com/userfiles/file/nuzoxajeziwevorovogaro.pdfIn PDF document text
- http://quiltingacademy.com/fckeditor/userfiles/file/34285460401.pdfIn PDF document text
- http://redemaisfarma.com/userfiles/file/87582951629.pdfIn PDF document text
- http://etabetasurvey.com/userfiles/files/29896434272.pdfIn PDF document text
- http://dermalab.pl/userfiles/file/nevixuwisoposavo.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aq6r41p3ec7ulp4rg9mfl80pv0/xexumajiwosetamulorijovot.pdfIn PDF document text
- http://domholidays.com/userfiles/file/25324772142.pdfIn PDF document text
- http://sushigonewildtogo.com/uploads/files/82418589580.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bec08ee3366ae4d294b289b0e6d620b0/zuludavug.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c195dcbd65---bokewaluwijudigu.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67677670b9---rimozowipoluzut.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499407032a---77710071234.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/abc3b26cccd81cd415351b06dfc75654/80382308358.pdfIn PDF document text
- https://trade.inter-ural.ru/ckfinder/userfiles/files/buliwop.pdfIn PDF document text
- http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/wipaxuxivuw.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780e4ef2dc---84839611295.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=variable+resistor+10k+pdfPDF 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_off0000d081.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD081	10764 bytes
SHA-256: `16d245b30e694b53b2e1406247fcf0e6fc92e279e485cee9ec7308a70e0a5577`
`font_01_sfnt_off0000e937.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE937	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010149.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10149	18220 bytes
SHA-256: `8c2b835a908f9c23d9745bd1628155ff7aef45c290669ad20d0735de66aeced7`

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