PDF malware analysis — malicious · 021d2f8faa39272c

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 00:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6816a63fcb4d60dbc888d8ba4bf0db7b SHA-1: d12125d6c3224ea873a9df9ee77a492a1cc5cd9c SHA-256: 021d2f8faa39272cc51290780c6248e92c492bfae3704e73cf60f166e2a1c4ac

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The primary attack pattern involves luring users to these external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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=frenchman%27s+creek+novel+pdf PDF link annotation
- https://hogies.com/includes/template/uploads/file/luwakotabizibafuvuzamor.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/siriwifazivikineg.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795660b13e5---80170379163.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/makidiwamusade.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e53117e514e9df647619392bc0dae243/3505401512.pdfIn PDF document text
- http://janjoling.com/public/ckfinder/userfiles/files/93944841133.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cb1e84f02d1fb7b7eaa4cafb49bcef21/62615511870.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8a123786---93125856196.pdfIn PDF document text
- http://apogeeconsultancy.com/upload/files/28366444020.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/kazodoruvetemutaxivefusi.pdfIn PDF document text
- http://bean2beenefamilytree.com/clients/60578/File/42522408506.pdfIn PDF document text
- http://www.stsmcc.org/www/js/ckfinder/userfiles/files/tukip.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2t4mebikuvgvvcnvg64tt3nki/zubosegutusa.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608efad07948c---93047040283.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/592df11d834fd5eea8de45f5f82462e1/bexadopawosa.pdfIn PDF document text
- http://olgapolyakova.de/files/files/zegogiduzokewosubarav.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb343d98a7---28955058139.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081549078364---wesivuxegupodotazenov.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ps00m61blqafhq6edlqvksie5o/8116451204.pdfIn PDF document text
- http://kraski-chernila.ru/resources/file/43962415191.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/79777104523.pdfIn PDF document text
- http://cgpreceptor.com/ckfinder/userfiles/files/6827829569.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8df3f6c52948d9410eb12b937e831841/202259492.pdfIn PDF document text
- https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/86560747716.pdfIn PDF document text
- http://newmob.it/userfiles/files/34589882022.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_off0000ed67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED67	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010579.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10579	17820 bytes
SHA-256: `ef333410205012a060b4b1cdb79708ae94b2ea54179337a66c2ff6d35cbe5f14`
`font_02_sfnt_off00013338.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13338	10864 bytes
SHA-256: `3cb7050867a08414852f955ef90881c2ca99092a9875611e010f4f3c0b61ac74`

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