PDF malware analysis — malicious · 305b8ecc028ec5e4

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c6946208968251ccd943de62c5d064c0 SHA-1: b32b4a50cadb033d33e9e07831bc81ac1aac5a1f SHA-256: 305b8ecc028ec5e48f23b3af84af291ef7e776038e464e8f8148b7984bab000d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

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.
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://huntic.ru/uplcv?utm_term=marginal+pdf+from+joint+pdf+examples PDF link annotation
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3b3af8d5---52944660680.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/64761719354.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mitlm97qikbnmm4m5bgjcs24ph/pefomafebiruka.pdfIn PDF document text
- http://energo-winstal.pl/userfiles/file/67501748144.pdfIn PDF document text
- http://kahounova.cz/userfiles/file/61571559870.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/201b7pqlh6hll0l1lum0o361ki/41079458460.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/jixodoreraro.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/13f99a95331d7129335797e970d35c89/mobevimamonibojezus.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/77201174004.pdfIn PDF document text
- http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufirewo.pdfIn PDF document text
- http://guoyangmoju.com/userfiles/files/38099534761.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ccbdb72b---34914315773.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee3fa99cf---91087220459.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799708b10bd---37588122314.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/36a15fa9d3107cbd26cfa1a4e4e21f81/23641381691.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28c189d71---nesala.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb1893e435---6936289922.pdfIn PDF document text
- http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qtb630qd99dnhvjrcbjfjblol3/55083533138.pdfIn PDF document text
- http://yokosohk.com/files/fckfiles/file/3815200549.pdfIn PDF document text
- https://pensiunea-escape.ro/ckfinder/userfiles/files/59795253101.pdfIn PDF document text
- https://ms01bet.net/contents/files/30998626336.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca28d726a0---5217240766.pdfIn PDF document text
- https://bacninhonline.com/webroot/img/files/1828825350.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/60503119946.pdfIn PDF document text
- https://aimhc.com/userfiles/file/63593603890.pdfIn PDF document text
- http://pumarecovery.com/userfiles/files/ziguj.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_off0000d8e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E4	17344 bytes
SHA-256: `c0f2cc18834d8d3b6e5592bb1f132fe0f3e5b7565cb00b075987c93cae03e1a2`
`font_01_sfnt_off000105c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105C2	11064 bytes
SHA-256: `b57e8de14df96d7697c5361050f2959048b6f64b6bc0fb59c80b8a9786a9316a`
`font_02_sfnt_off00011f46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F46	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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