PDF malware analysis — malicious · c8ca9e36320402ae

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 9b4cea473c5fae2953c48595c34aaa02 SHA-1: ddd1ff8eee9f6fbd81ec07390cf4f0f4e12c3ff5 SHA-256: c8ca9e36320402ae3b20cad9791d641c4205d5419e2e465df009576f8d358f0f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which appear to be part of a link farm on disposable hosting or compromised CMS uploads. The primary function appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://queure.ru/uplcv?utm_term=slow+motion+apk+pro PDF link annotation
- https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/6676746275.pdfIn PDF document text
- http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/jibuzamekalete.pdfIn PDF document text
- https://nieruchomosciprzetargi.pl/files/file/tazesorekab.pdfIn PDF document text
- https://irepairplus.nl/app/webroot/files/userfiles/files/75127852354.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415bcf7a65a---94636206482.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/domimugo.pdfIn PDF document text
- http://lex.tj/img/file/sugifupevakem.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429feee5495---90754115941.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bc7011e27---52097031482.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9g5t5tt5501eh2pm49nc28bve0/40434622214.pdfIn PDF document text
- http://focalthai.com/file_media/file_image/file/mewafuzosugelavu.pdfIn PDF document text
- http://officegate.biz/admin/fck_upload/file/67739937585.pdfIn PDF document text
- http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/42889364832.pdfIn PDF document text
- https://vokalensemble-vocembalo.ch/userfiles/file/50175434591.pdfIn PDF document text
- http://papinchess.ru/userfiles/file/69224697034.pdfIn PDF document text
- http://majortaylorride.info/images/uploaded/file/lidubotubaxaxowimejasez.pdfIn PDF document text
- http://sedaciesupravy.sk/media/file/6859000112.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137805378bf4---59968339849.pdfIn PDF document text
- http://twilaw.com/files/files/85213562376.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161493854de269---nufuw.pdfIn PDF document text
- https://fallsplat.se/bildbank/file/vimovanutefivazeda.pdfIn PDF document text
- http://angelascanu.it/uploads/file/7747821717.pdfIn PDF document text
- http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/43763101002.pdfIn PDF document text
- http://russia-ex.com/images/blog/file/27052465983.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/79683778639.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_off0000b267.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB267	10368 bytes
SHA-256: `168dff13382d818648d2bfd8857fe65b1c4d6979bf1be332545d2b5c316ff424`
`font_01_sfnt_off0000c9cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9CC	16476 bytes
SHA-256: `5286d2787a1dbb3e6d23d1239995444138be85792401fc44e79dba25b4258b9f`
`font_02_sfnt_off0000f350.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF350	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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