PDF malware analysis — malicious · cabcd860897f5b15

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 05:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4e589dde0fbc37ecd5a5eaec2b1ad3f5 SHA-1: 70aeed96a231c75efdf9abcb01ead2275defa348 SHA-256: cabcd860897f5b1589c6e12f29ef5aa07d674596c3e4048bece6c205eceebc8b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) indicates the potential for executing malicious code within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2588784d5---sobozabidejatoderen.pdf In PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e34734cd---21790380988.pdfIn PDF document text
- http://ranjitabiswas.com/userfiles/files/70686908666.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/fawifefet.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2j8fm4e83hlfe76tcgap7pc0bh/5172756850.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f330acd1e---4063664268.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc5a9741d---zotofupidumozibuvenoso.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d3b65da4---37216863204.pdfIn PDF document text
- http://chocoenglish.com/_UploadFile/Images/file/nilutovakudowanadimowa.pdfIn PDF document text
- http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/nadowu.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26fcb5c31---20297913248.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543043ae88---mazanuwela.pdfIn PDF document text
- http://albarossa.jp/js/upload/files/92806896130.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608659b35b2d8---komabegadorutuxufidupomaf.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a192cfc5a007047904cd6e6bab14637b/2942205744.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d71dc1e2f---97280662906.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfl9ofro651ss5snq2qnjs8bh8/vigepadufipoporopaxu.pdfIn PDF document text
- http://megalaserasia.com/upload///62396135749.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6e0e3bc6f38b06121ef1ed05a6fee921/66183345444.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ebbc6a21dfeeaea71fe29c65a498b0e9/33813459322.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea06568fd4---54556329074.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b796b018---moweletax.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=badminton+game+rules+and+regulations+pdfPDF 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_off0000fbf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011408.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11408	17552 bytes
SHA-256: `c087c34a0f36df6f404846529fccda796b1ffd5132c17ead5529718d3dfa9dfd`
`font_02_sfnt_off000141cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141CF	10996 bytes
SHA-256: `2592d3e5a10692d9e28c20b9ccb348a2fa4dcc8082a57fe6953c30fdb6d110f3`

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