PDF malware analysis — malicious · af8f0f33d267e683

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5b87293894c57a1974b18fa5f6ed4be7 SHA-1: d53c0f2309deaaa9fe3c8587f483f89fc4d3dabb SHA-256: af8f0f33d267e6835f29fcb9ec9bbd82a3c7f8e10f4d166fc18f8c70e713be86

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are benign, are part of a larger pattern of redirection to unknown or suspicious domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://sunridgecorp.com/uploads/files/202109031029526062.pdf In PDF document text
- http://cgemfoco.com.br/ckfinder/userfiles/files/23173815016.pdfIn PDF document text
- http://ceramicaartisticamarsalese.it/userfiles/files/96656253522.pdfIn PDF document text
- https://firesystem.ro/imagini_ws/1478147861.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/zizejozaretoremi.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fabf161630370d3a4bea26cf90c743a6/80388228410.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/ketilexirolezibilurew.pdfIn PDF document text
- https://www.mds-horizons.com/upload/files/97779628126.pdfIn PDF document text
- http://saringkarnwood.com/UserFiles/file/kasibazipudoderabolopa.pdfIn PDF document text
- https://ljlconst.com/admin/images/file/fevewewoxoripuxabenake.pdfIn PDF document text
- http://zoldjogsi.hu/uploads/files/ketebarixutekegus.pdfIn PDF document text
- http://gkz-crimea.ru/userfiles/file/wunodukokedijikafisimef.pdfIn PDF document text
- http://szyuangang.com/UserFiles/file///59808957950.pdfIn PDF document text
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae4161278f238c930d728fed234f414/5629098424.pdfIn PDF document text
- http://tangiahoang.com/skinkorea/Images_upload/files/lakukaze.pdfIn PDF document text
- http://web5gstore.com/Files/files/2172845663.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb7891a38---6653184975.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/26f8d069a712532df97f30a3c8daf736/12599847522.pdfIn PDF document text
- http://xinnethk.com/userfiles/file/vokoxakuruxa.pdfIn PDF document text
- https://ximatinhdongnai.com/app/webroot/files/images/pages/files/97316121759.pdfIn PDF document text
- http://cuacuontoanthang.com/media/file/kekekasigamamezedepopaj.pdfIn PDF document text
- https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/dubafusewulirojikora.pdfIn PDF document text
- https://copperscraphandlers.com/ckfinder/userfiles/files/xeropo.pdfIn PDF document text
- https://kapefashion.com/files/files/85751213356.pdfIn PDF document text
- http://mislenyiallatorvos.hu/userfiles/file/mufanezovifedijud.pdfIn PDF document text
- http://aurora-c.jp/files/files/wexajuzi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=100+greatest+heavy+metal+albums+of+all+timePDF 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_off0000be59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE59	11056 bytes
SHA-256: `36dd294cbb63ede493a8c40d1652a494f54a1b467c48d64486afda7a7ec875de`
`font_01_sfnt_off0000d828.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD828	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f03a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF03A	16684 bytes
SHA-256: `79e1601f1c22b5a4e0ecc1e2d713da62e45cb7d1eeaaf306c37bf73da9167e62`

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