PDF malware analysis — malicious · e86c7de668699c0a

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 02:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 91497988a67c46be4b112ea70f648435 SHA-1: 274c7e1f39e642e7cb5e82c007ee339e8c7b519d SHA-256: e86c7de668699c0ab66ecdfd85339838ef4dd6a83af475962f7f81167662ea90

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links pointing to compromised websites, indicating it's likely used for phishing or to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6d0ec5f4---9944197058.pdf In PDF document text
- http://garage-fuji.jp/js/upload/files/12345757345.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/afde7c7dce72ba67ca1f719254a9f22a/rivujilidasoba.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf615e5fe---27970204282.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/984b60a9362d4e897ee855a509adc43a/sudapifoxuturusixesi.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/rudufinifajutipixujitijek.pdfIn PDF document text
- https://stop-remont.ru/ckfinder/userfiles/files/16225726724.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967d753bf53---jimevedusoberola.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/98747469832.pdfIn PDF document text
- https://doucetplasticsurgery.com/ckfinder/userfiles/files/bamazufazaxebam.pdfIn PDF document text
- http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1628329900.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c142c3b77---toxuvetatixejosuso.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tj2l5q35h1uc0l0nsepup5ss85/8355124964.pdfIn PDF document text
- http://consulcongress.it/uploads/assets/file/46779252660.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a07467c8d8b16326d68153aca254b1c/tusodi.pdfIn PDF document text
- http://fujieshubao.com/zk/UploadFile/file/2021081006292773499.pdfIn PDF document text
- http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/lalevowodutabosananuda.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02f88bcf2d02d28fde18e069d2243535/38624251790.pdfIn PDF document text
- http://monterroso-construpuntos.com/campannas/file/luketijufiwiton.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff505cdd26---93678901988.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b737192a011---61043557710.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2f0586600ac041f9b2e7bfdc737b2f29/38206595578.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/redoposozotagufexufuloz.pdfIn PDF document text
- http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musifalowepowukigeta.pdfIn PDF document text
- https://ritascreation.com/userfiles/file/34146637165.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e055f8911bb---57271466676.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=altivar+212+lonworks+manualPDF 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_off0000b53e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB53E	14388 bytes
SHA-256: `b273840e51f40d122260ec0fd8088b11e47c896e70a8d8cf186147e244f8626c`
`font_01_sfnt_off0000d92c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD92C	10636 bytes
SHA-256: `6b5c5336d15f2b63904d3405c5601b07007e923bf38fbae5ba27cf7e215817ec`
`font_02_sfnt_off0000f1ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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