PDF malware analysis — malicious · e1171f721979505d

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 02:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: b6bfe31b35240ccdd0ab1168756a52df SHA-1: af2dd4a011eadca699ff5e181f997e9e56f305ca SHA-256: e1171f721979505d7314f9482a318dee3fa3e3f77dcb7d5716345edc0405ddce

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links to compromised websites, many of which appear to be part of a link farm designed to distribute further malicious PDFs. The presence of a 'download button' heuristic suggests a lure to trick users into downloading a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://oniceh.ru/uplcv?utm_term=download+advance+server+free+fire+2020 PDF link annotation
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b47f349a06a---dugasatupufiwokatim.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607de88fa522b---leboriwopogatobutumuxodek.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4aa3a7e1---37210088115.pdfIn PDF document text
- http://vitajeans.com/ckfinder/userfiles/files/xofogiwobozivebezaj.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608328af675c6---51979468984.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb37f777c5---22970824886.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/daroguva.pdfIn PDF document text
- http://agroanaliz.by/upload/editor/files/dumokuvug.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5c8720ec---sozonugavonaditomutixa.pdfIn PDF document text
- http://sgd42.ru/userfiles/file/tovimomabogobibedawikem.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8dd0514e---84624194936.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sf4190kocjr1k69mpp0o6r7nl1/6605167582.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b397e1cb9f8---27740087684.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f8f19f47143e195e01270fd9faa6b315/vowuwinujutug.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d468f98d27---riwozesowixigalugazevu.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/94041d0c71f32c555199e2d3e3cd818e/savojivadudomerozojak.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cb2a6fd1b1ae0893d54632591eea8a34/rejarojivuwuxopowufiv.pdfIn PDF document text
- http://timandlor.com/userfiles/file/84908395607.pdfIn PDF document text
- http://bebelino.ru/userfiles/file/lugamo.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kvst8oqfnfm82sb7soas46ejni/80101306672.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe3a2db7---jovajagokojazo.pdfIn PDF document text
- https://okud-istra.hr/userfiles/file/buxerez.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de2dbc8bf---37714508121.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bgm8847vof9n7eiog6h7cc7o24/7438811318.pdfIn PDF document text
- http://nsdadventist.org/FCKData/file/lilokusedefu.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0f0a29d91---63238016736.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_off0000f184.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF184	10768 bytes
SHA-256: `a2d81dca75fb154bc60222f8ad5248c74a8132b82597525c0d2de50775e2a4fe`
`font_01_sfnt_off00010a7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12290	18060 bytes
SHA-256: `001b1860432b14e026a40eb5ec91f7d34c36efb884ae0dfb12e8c93290b7d159`

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