PDF malware analysis — malicious · 9e75c4b3e1897347

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 05:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 09cd4c1f1fc1b312d3111be608839575 SHA-1: cf4cd999f10025ce15ee577a6cf79f8383478459 SHA-256: 9e75c4b3e18973478c97bc005220346a1e6a62f704fcb19720b139f88283a0ec

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=jj+smith+smoothie+pdf PDF link annotation
- http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xibat.pdfIn PDF document text
- http://kleinschadenexpert.com/userfiles/file/jusitesapubezo.pdfIn PDF document text
- https://procogs.com/FCKeditor/file/37829546345.pdfIn PDF document text
- http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/wuwizovususaloresefelur.pdfIn PDF document text
- https://arbormaster.us/uploads/files/gipuka.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/70c41bd237f4cebeb4df07726805258c/24859395477.pdfIn PDF document text
- https://makiriaszto.hu/ckfinder/userfiles/files/powatanuxowijesibixizopom.pdfIn PDF document text
- http://klick-tipp.info/ckfinder/userfiles/publics/files/93173398738.pdfIn PDF document text
- http://esoftland.com/userfiles/file/2760850915.pdfIn PDF document text
- http://menifee.hanasushichoice.com/uploads/files/bagowuwekewum.pdfIn PDF document text
- http://eventclub.pl/userfiles/file/42695069332.pdfIn PDF document text
- http://hoangle.vn/uploads/userfiles/file/simibenagesaliluv.pdfIn PDF document text
- http://cuanhomkinhtoanthang.com/media/file/87570505755.pdfIn PDF document text
- http://primeasset.hu/fileok/file/25187851305.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/9598934749.pdfIn PDF document text
- http://eikenhorstgroep.nl/userfiles/file/79928184007.pdfIn PDF document text
- http://archive-2014.humandoc.pl/attachments/file/15264090661.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/fuzekabugamuwu.pdfIn PDF document text
- https://szalkasszorutacskok.hu/app/webroot/files/content/files/bupizivip.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fa91deeb7052bb129689ffc202ab7e60/73970018485.pdfIn PDF document text
- https://subarini.ro/mm/file/43303926412.pdfIn PDF document text
- https://simbhaolipower.com/images/file/nonegibu.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614823945d525---kefojonipobuti.pdfIn PDF document text
- http://www.sictombbi.fr/ckfinder/userfiles/files/71503101991.pdfIn PDF document text
- https://cukimentescukraszda.hu/files/files/gumosopu.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbfcc5532---savarapiselofukefi.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_off0000dc0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC0F	10472 bytes
SHA-256: `75eb029e8a7cfd29487959a718f17047c7e20e648932a5b5609f932999489626`
`font_01_sfnt_off0000f3c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3C7	18348 bytes
SHA-256: `8458d034e9803e92f18f419c5077bb6a9ffcdffd3430efb30b7d7fd8a667e590`
`font_02_sfnt_off00012380.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12380	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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