PDF malware analysis — malicious · 03aa27c9218662c8

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 11:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 04f187956e396e572921bbe9a575dbfd SHA-1: b8af3b6822cb67393f0b2f93377fa189336d78f7 SHA-256: 03aa27c9218662c872fdc12d476e2dca1fab69b7dc570a8f54b74160573472bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The heuristic firings indicate a pattern of SEO-based link farming and the use of disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://smidgel.ru/uplcv?utm_term=boston+bruins+schedule+2019+pdf PDF link annotation
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a637a4f74c---82135521805.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/59155057189.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2eb9608ed1d3145df0b00aaffad29498/5143564285.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/riguxela.pdfIn PDF document text
- http://huile-de-nigelle.info/userfiles/file/jututufojef.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68321288f7---40685410875.pdfIn PDF document text
- http://cariboohose.com/userfiles/file/5578463221.pdfIn PDF document text
- http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/wesonasapibewavuzonu.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d95d098821029e6b0bc5ce2def96836f/tufofidufet.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a2683cae---raworamibewowekozasapisiv.pdfIn PDF document text
- http://tktravel.shop/FileData/ckfinder/files/20210611_B86D7E52B53A66F1.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ecd842fa---83865291186.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d526eeaba2a---88863567843.pdfIn PDF document text
- http://ampletrekking.com/userfiles/file/xekaxo.pdfIn PDF document text
- https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84ae8f905---mupomisajifozotejen.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077065b39ddd---3593192304.pdfIn PDF document text
- https://pt2-turbo-j3t.com/contents//files/69952544129.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1f65b1cf---18687994567.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.com/upload/files/10171735742.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2d447c93---11824115729.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/kesopekadimemig.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cac76757ba7---84785620124.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/v0ffr1opepeg17eo5oqop0vgt2/ravogasefabelanafu.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0710tu20mdc7vkk5asm0aai5h4/42565342142.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lbdol9v6cb3ja8dlldgooc7g9a/48774180465.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/af4b1e2f3c7a1ce4eba1b5f804ca664e/jiredanopejeg.pdfIn PDF document text
- https://pt2-turbo-j3t.com/contents//files/lipafapowadonudulukewibe.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_off0000bf4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF4F	11312 bytes
SHA-256: `dff38a866405f74372ccddbb04a22a206efaa82b580211c4c3fb224c7ab6f01e`
`font_01_sfnt_off0000d9b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f1c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1C7	16824 bytes
SHA-256: `839aba5514f36b966cd06f4dc6e1e3c7215cf20f2c1d18357542da59800f160c`

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