PDF malware analysis — malicious · 4ae4c5956cf6f46f

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 14:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 67fba674e177d213c5265138cd0b68f8 SHA-1: 77c83277fc95287d27b28df2581a541db56d3dd3 SHA-256: 4ae4c5956cf6f46fede48efb309e274b50eed782e09fd582eed0c4b7835aab5c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to host and distribute malicious content. The presence of a link farm on disposable hosting and the ML classifier's high confidence score suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 7

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.
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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1ohd58ejdjk1m3dp75h6tmokel/91716371269.pdf In PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c067044bd9---3543075287.pdfIn PDF document text
- https://easypayindia.in/userfiles/file/6805348557.pdfIn PDF document text
- http://plnjl.com/userfiles/files/binopizubu.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bf5b8c00830b355f28209396c70b9a66/21628432226.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9397a2cc---vivulufunizilabuxuwedu.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/50409629166.pdfIn PDF document text
- http://ukrainski-rosyjski.pl/userfiles/file/buxoseni.pdfIn PDF document text
- http://insidethedigitaltrend.biz/userfiles/file/barafalakokoxoguwitunomiz.pdfIn PDF document text
- http://transbur.ru/admin/ckfinder/userfiles/files/42042283382.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c860ad03315---54220284072.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075100c36e5e---31602593671.pdfIn PDF document text
- http://crmloccitanecr.com/campannas/file/rajoxuzezawesigoxijugo.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7534325281e004c6835a692d81bbf8ba/53914395122.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/34104360204.pdfIn PDF document text
- http://quimis.net/js/ckfinder/userfiles/files/72343732752.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8d61a9ec---16875139136.pdfIn PDF document text
- https://nbtele.com/en/cache/fck_files/file/vedomamizijofexo.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1gdvu5pc84v83slsdn0sqeairq/491078398.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077267fbe497---67691130699.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/69e3272ea6fd2e50a73a95a07e2cfd56/56656567987.pdfIn PDF document text
- https://ubranni.com/uploader/files/79180643243.pdfIn PDF document text
- https://seerupit.dk/assens/file/24955061052.pdfIn PDF document text
- https://srilangkapools.com/contents//files/zubup.pdfIn PDF document text
- http://thanhcongtechtra.com/upload/files/lamimeramenotukabubedi.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/79673795519.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tmnt+pc+game+downloadPDF 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_off0000e7ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7EA	16408 bytes
SHA-256: `6de9475cab97a4b8e54c5022a5941890f96a86095f9437a3872c4bd285355072`
`font_01_sfnt_off00011264.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11264	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012a7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A7B	10544 bytes
SHA-256: `c39135b3c3ce6b31aaf72c49a310598a6769079c6e4e2cd25d780444dc629196`

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