PDF malware analysis — malicious · ff0d8e2b682436ec

MALICIOUS

PDF

98.3 KB Created: 2021-09-13 18:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1cb0011db33eebc3d23bb75f40e0a0f5 SHA-1: c050022fe2b7369939936100cb32963cbce582f0 SHA-256: ff0d8e2b682436ecd61a49232205fbcc4ac179bbd943fe9d18ad0cbe251f92c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to external resources, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9700

Heuristics 6

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.
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://tfh-filter.hu/_user/file/4366578014.pdf In PDF document text
- https://sonerofset.com/userfiles/file/zadeleronimotolokolame.pdfIn PDF document text
- https://xedulichhaiphong.vn/images/news/files/80456976022.pdfIn PDF document text
- https://fleseriuassociates.ro/files/file/getatodiwazojejeda.pdfIn PDF document text
- http://china-miyaco.com/img/file/20219211252.pdfIn PDF document text
- http://xinyuemu.net/assets/202109/files/20210904235830304525.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/wunakuvariketezuz.pdfIn PDF document text
- http://teknis.it/userfiles/files/65149549612.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/jufuwiz.pdfIn PDF document text
- http://supermarketdv.ru/files/file/dinuwi.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59b70790f---wojeputogutanoravupamota.pdfIn PDF document text
- http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/52098559032.pdfIn PDF document text
- http://studioguidobarbieri.it/userfiles/files/37493482337.pdfIn PDF document text
- http://www.almansori-ye.com/almansorifiles/files/7839211928.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6bc6349f4---76783992579.pdfIn PDF document text
- http://distant-property.ru/fck_editor_files/files/88719613593.pdfIn PDF document text
- http://miraesusan.com/ckupload/files/37701630382.pdfIn PDF document text
- http://solemarservizi.it/userfiles/files/varuwinekoxej.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/71623703598.pdfIn PDF document text
- http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/52912954720.pdfIn PDF document text
- http://ozdesignhouse.com/app/webroot/uploads/files/kezaroturapalogidenarip.pdfIn PDF document text
- http://blackivy.pl/userfiles/file/24291915977.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/29445867449.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/61c20ec857b2af7c7e9b5d3dbd7a03af/61101068077.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5c62756290b9cebb3efc832e8e191fc6/96967495944.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1631427502.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=13500+v+bucks+deathrunPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010cf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CF8	19104 bytes
SHA-256: `66da95672579cfd229db6b735c4b7517572ef6ede099c08aae97165b42e56751`
`font_01_sfnt_off00013f00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F00	10988 bytes
SHA-256: `0d9ea268d0c6312f32953e4246e4e68983b7d664e4b5ab6fb9e11ff4abdfaaef`
`font_02_sfnt_off00015890.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15890	2300 bytes
SHA-256: `fa62b758530ecec3eea0b75977e33c0097dc9cff627bf0140d1d6052f8da7b4a`
`font_03_sfnt_off000162c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x162C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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