PDF malware analysis — malicious · 287a2a94843cddcf

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 22:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e24829505150c665e261c31877cd7090 SHA-1: 868e8ac22382e09e34d8e50d7e3066268343867e SHA-256: 287a2a94843cddcff58a93a6ee0840a6bbadede6f66eb949348c4ee552781dc8

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users. The presence of multiple compromised CMS upload links further suggests an attempt to distribute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=youcut+pro+mod+apk PDF link annotation
- https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/5206860523.pdfIn PDF document text
- https://newchat.xyz/js/ckfinder/userfiles/files/tisinaku.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/sisatosetifatelazaz.pdfIn PDF document text
- https://xpress2.eu/ckfinder/userfiles/files/jolebexo.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137387ea5457---wolanilubik.pdfIn PDF document text
- https://gullyracing.it/admin/ckfinder/userfiles/files/33359742357.pdfIn PDF document text
- https://cribpointonline.org/cribpointonline/userimages/file/busuzaliz.pdfIn PDF document text
- http://sakesushilakehavasu.com/uploads/files/84940807349.pdfIn PDF document text
- http://zabbeleecooking.com/ckfinder/userfiles/files/buvuzazome.pdfIn PDF document text
- http://vipnjl.com/userfiles/files/88146417889.pdfIn PDF document text
- http://izeninfo.net/admin/upload/files/najejaruxuvabamonujixeda.pdfIn PDF document text
- https://pediatricpotentialsnj.com/PP/PPpng/files/44170468718.pdfIn PDF document text
- https://mt-creativestudio.com/ckfinder/userfiles/files/90474002892.pdfIn PDF document text
- http://osteriadelcampanile.com/userfiles/files/moresazatulisone.pdfIn PDF document text
- http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdfIn PDF document text
- http://restokrat.info/userfiles/file/74714340825.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0152fe758a698ea5a55b6baef888ede2/zabugajuxijezif.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86be45adf---79489280253.pdfIn PDF document text
- http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/23575344548.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a3e0535a0c6ef141c889c1df10b1d/54771989212.pdfIn PDF document text
- http://www.biogreeno.com/cms/ckfinder/userfiles/files/97784851362.pdfIn PDF document text
- http://architettoangeli.it/userfiles/files/pikegiwipufebebupo.pdfIn PDF document text
- https://comptables-publics.fr/userfiles/file/37424690195.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_off0000e1ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1AD	19032 bytes
SHA-256: `733ffe1913499cf9f14a484bf3387128cf6177751b946c59b8d3070eaaf8724c`
`font_01_sfnt_off000112ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112AB	10308 bytes
SHA-256: `9fb6e24401cae78005ee58cf4280697396fa0a32e40a3e421ce5fb3bc42f5cfe`
`font_02_sfnt_off000129f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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