PDF malware analysis — malicious · b1dd9843d415a996

MALICIOUS

PDF

78.4 KB Created: 2021-08-09 09:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: c0299d0b31af3e51228e08086b138bc0 SHA-1: 56f79668ed8be8c730e5b2a1419e64e4cbfd210f SHA-256: b1dd9843d415a996521a29d203c0294e1216440dab3c51c18cb6a12f2f4b1e5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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://synerhu.ru/uplcv?utm_term=ejercicios+de+nomenclatura+quimica+organica+amidas PDF link annotation
- http://lnianemarzenie.pl/userfiles/file/kopedaxazitotejugato.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a83a5bac---wupefulifenetunasijutajo.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/94756922dc78f2d3de9f3e36edcb30b1/dejatavepomojezonukusopaz.pdfIn PDF document text
- https://satuldelut.ro/ckfinder/userfiles/files/15508092166.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160752702b6080---13076021634.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/741e0tbrks8ok96li2pbbd9lj6/77969402761.pdfIn PDF document text
- http://eotp.info/sites/default/files/fck/file/35833229734.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/28946346567.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da86a11766c---xijemipewaxatepesadug.pdfIn PDF document text
- https://sfeerweter.nl/userfiles/files/95430363823.pdfIn PDF document text
- https://homecareangels.ca/files/files/files/61690322671.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5a241ed521b4f12e74446e2fe172dc95/68360046108.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6edbce204b---5426705656.pdfIn PDF document text
- http://domholidays.com/userfiles/file/31467989896.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adebc52111d---sukukemasamenoj.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2556a80e---tisovoravefanajelelon.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfba570b6c---21594547719.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/79940645114.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/wulimafeketa.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/adc29758afd0ead7f4f9a8007d0b557e/zixafo.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f929caabfd4---46009613855.pdfIn PDF document text
- http://prestinoequitacion.com/imagenes/upload/files/76255596022.pdfIn PDF document text
- http://jtour.vn/userfiles/file/fuvakurapawoxunafisapen.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608417221fc7c---37674079907.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/om492hgh35d2sefc2cf1ffjeq1/99908697198.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_off0000cca2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCA2	17048 bytes
SHA-256: `3f046a5ff091154cab5079969a123cb84f984887f65bc006b282c6a57c47d2d1`
`font_01_sfnt_off0000f7c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010fd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FD8	11072 bytes
SHA-256: `7fcccd14d0ebed09f0747e8b0acbdd6a04146aa0f03ee8b5c3c372e8de71d7e1`

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