PDF malware analysis — malicious · 8f598f702efd2683

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 03:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 67a6a613fc5753ee9cd7f2b220361284 SHA-1: 5fabe4fbba5e578d00d8319cae579003048e66ee SHA-256: 8f598f702efd2683bc97787e7ae37856490bf618de52c42ce29a1f18f8d4c9b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://winkeleninzundert.nl/uploadimages/files/robubetegojazubapeludax.pdf In PDF document text
- http://dailythang.com/userfiles/files/luvuno.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac7cb0214---tezusokuj.pdfIn PDF document text
- https://prolocolidodisavio.org/ckfinder/userfiles/files/fazuvudanu.pdfIn PDF document text
- https://electrodomesticaruano.com/images/ckfinder/files/gabesowekaviwoxazosulobu.pdfIn PDF document text
- http://chipublichouse.com/ckfinder/userfiles/files/monupuwisekodupujanadoge.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cf63e11ab8481b94fb23265a00be2c43/52947139197.pdfIn PDF document text
- http://contelex.it/userfiles/files/45182215928.pdfIn PDF document text
- http://eltprof.ru/userfiles/file/paxukatujizakezepudaja.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45479345d---zokix.pdfIn PDF document text
- https://mbzl-pro.xyz/web/img/podborky/files/43850692126.pdfIn PDF document text
- https://careersourcechipola.com/files/public/23535804407.pdfIn PDF document text
- http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7c0e191f---tulajapaxukuzepog.pdfIn PDF document text
- http://universalthailand.com/images/uploads/ckfinder/files/18657419166.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613237327d10b---ratekumunutesebijisuj.pdfIn PDF document text
- https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/varatuveriwa.pdfIn PDF document text
- http://citysoupsbellevue.com/uploads/files/lotajozeduzaba.pdfIn PDF document text
- https://stealthwindow.tw/uploads/files/202109070352363041.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/zemojesiwiwu.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4a7a1aa5e9eddb9693b0d5ec2d5f5a56/mutepo.pdfIn PDF document text
- http://massimobertoarchitetto.com/userfiles/files/30039515421.pdfIn PDF document text
- http://ucg-eg.com/userfiles/file/51896439424.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/14891909848.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=memories+song+download+mp3+pagalworld+mp4PDF 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_off0000c216.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC216	17172 bytes
SHA-256: `3d93f68bb50ffab17fd0c29dd96d96c5670b4bc4f5908e76b173bd68aa84e9cf`
`font_01_sfnt_off0000ee71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010688.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10688	10968 bytes
SHA-256: `47f11efb12eeb705e27d8fe4c11d89459f4e8460a0982a490369c6a2b97fd7e6`

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