PDF malware analysis — malicious · aee1f39438834c8a

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 10:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: f2ab5dd6033b3b735ad2db8bbfc8a582 SHA-1: 7645cd0c1a200548146c0fdc31fdc04b51c1c8d6 SHA-256: aee1f39438834c8ae0dd2b637ede35268f7b6a26f81106d2c16ac3b5dfa851e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this document functions as a link farm. The ML classifier and ClamAV detection confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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://irlanc.ru/uplcv?utm_term=chemical+structure+of+amino+acids PDF link annotation
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614195c47e16e---mipigisukenopuv.pdfIn PDF document text
- http://gianenricofabro.com/userfiles/files/womaw.pdfIn PDF document text
- https://traffictkt.com/viking1/uploads/files/4407673990.pdfIn PDF document text
- http://massiimo.com/piceditor/file/laroguxekerazag.pdfIn PDF document text
- https://corpeverest.com/ckfinder/userfiles/files/79057188489.pdfIn PDF document text
- https://alsharqcc.com/userfiles/files/kefumafarupasugu.pdfIn PDF document text
- http://www.offshoreyachts.net/web_upload/editor/files/66922366944.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/89501147086.pdfIn PDF document text
- http://hoitruyengiaocodocvietnam.com/uploads/image/files/jedipazusimopakasapanuli.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/4779401438.pdfIn PDF document text
- http://avalon-essenzen.at/userfiles/file/zixoxojodaruluduvugit.pdfIn PDF document text
- https://www.renouer-auxerre.com/ckfinder/userfiles/files/bekekomejufugexigonuwu.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210915173140.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/miwevevabidasosopakibis.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5be549d1---kosagudugesitepupowozaf.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/253e6a71bd9abb685da1b1999fa6220c/sofupenusomu.pdfIn PDF document text
- https://vieclamday.com/userfiles/file/xepadifepedu.pdfIn PDF document text
- http://neapol-m.ru/usr/file/2024138692.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/nereganavilusiri.pdfIn PDF document text
- http://gerastar.com/userfiles/file/mazofawu.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ab409216---66870847149.pdfIn PDF document text
- https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/tigunebalexitigow.pdfIn PDF document text
- https://perfecthospitals.org/ckfinder/userfiles/files/vizav.pdfIn PDF document text
- http://bio-scan.com/userfiles/file/49186130908.pdfIn PDF document text
- http://pescepiana.eu/userfiles/files/45984048648.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b6ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6ED	10872 bytes
SHA-256: `41fcc9b991afb10dc3b724fc522251ad166530bb7357426fda68c4465b6e0d19`
`font_01_sfnt_off0000cfdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFDC	16140 bytes
SHA-256: `2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786`
`font_02_sfnt_off0000e55d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE55D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0000fd6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD6F	17332 bytes
SHA-256: `c1165a24ed39f875d30e65cff9888582526c0e2749311b34bdb3a3d821e2f9e3`

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