PDF malware analysis — malicious · 695e4257bc3afccf

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 08:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: bac1b94e997001a334ff2cb44d1246f0 SHA-1: 6b35db3bfe8af1565893a0299e110ec3432a29f3 SHA-256: 695e4257bc3afccfaed81ca338fc2a16c880864dffcc817e0a6cd0fb498ba136

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one identified as compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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 http://schubert-hh.de/image/file/76975688195.pdf In PDF document text
- https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sotunemov.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/wafalirunotibisamizovijan.pdfIn PDF document text
- http://bobas24.pl/Upload/file/4443490752.pdfIn PDF document text
- https://cicadit.ro/UserFiles/file/xajilafin.pdfIn PDF document text
- https://autohausnschmidt.de/userfiles/file/benomoxetixunodiva.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/kutilisalakoz.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c098676aa3e---totaxaj.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fe3a8f76db27ee02ae3ddf3caaa0df35/1697568099.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f97330959---60399871967.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ds77ko3jge4pg7ubni39dajto0/bazabidowarixuwabeworobu.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/kunikugixikaf.pdfIn PDF document text
- https://fidelishospice.com/ckfinder/userfiles/files/65381022816.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3r0nvaop9jgo64src9lsp7git1/kekipanudoturexisa.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f52f8550f---65700106310.pdfIn PDF document text
- http://villa-margherita.biz/userfiles/files/72921441389.pdfIn PDF document text
- http://xn--aknmedikal-yub.com/uploads/file/zurisebovifesabojekodo.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c6af1b78---gubedesonaravezibodawiwo.pdfIn PDF document text
- http://www.salac.cz/ckfinder/userfiles/files/25154793458.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1139bdac1ab0d06b9b2679509ae08e0/foxavigo.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/13176043845.pdfIn PDF document text
- http://burragebrothers.net/demo/jolie/beta/userfiles/files/49066076624.pdfIn PDF document text
- http://hotelrealerimini.it/userfiles/files/84210891702.pdfIn PDF document text
- http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/togev.pdfIn PDF document text
- https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rufukisivupo.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/1757520600.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=area+bajo+la+curva+integrales+ejercicios+resueltosPDF link annotation
- 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_off0000edab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDAB	19040 bytes
SHA-256: `b0b234e2aa42c9545b31f4529bdbdb15d051e4f31b69b28cd548b03d58bda31a`
`font_01_sfnt_off00011f2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013743.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13743	10824 bytes
SHA-256: `8957101e6a29b17c1646ffa920e47a7d7b91a92971ec0f6e199d43d86ae9d2bb`

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