PDF malware analysis — malicious · 2b773677642cd0d6

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 15:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 858016eb995b79d713a95f9f30f7aa34 SHA-1: f2dd4f4eec0bc9280bff4598ed3a1f4e6819514e SHA-256: 2b773677642cd0d64736c2e67ffbca0e37e6e95e3f006696d81d41b59262bd33

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=find+element+by+class+jquery PDF link annotation
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6f648b7cde6163f9fb77e8be6c37eea8/zosobitozeladiverevivafer.pdfIn PDF document text
- https://used-machinetools.ro/app/webroot/files/userfiles/files/nagafasamow.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa1cc7cef---99473939436.pdfIn PDF document text
- https://securitegenerale.tn/userfiles/file/vakufefo.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/8818416923.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/478f5e9c7d645cd55a3f76ec408ec372/8184718065.pdfIn PDF document text
- http://esoftland.com/userfiles/file/38211476608.pdfIn PDF document text
- https://digireg.nu/upload/12300052103.pdfIn PDF document text
- http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/10255365003.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c56f83bfd0e79b88a21291a5ab10db74/85613572479.pdfIn PDF document text
- http://alliusie.com/userfiles/file/xusebu.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b50b80ab---43756900312.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3c651df28172d3c7177a4c319a30f4d7/wosufogasutin.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/05e737e269e9a557bf9fbf1acf4e1f61/65194167469.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f9rrml1pcod1157vg3r4lhhjk3/24989995467.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1b639ff6---xudoroxozapebaxakekago.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/20215141322331516.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b2fb59d7ded8358f4648b1444c8590d1/15320088488.pdfIn PDF document text
- https://nhadatonline24h.com/Images_upload/files/jagajipulilajakuz.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/17584592813.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e3e7c83---39998954154.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfd98686d---28522043838.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb4bdbc90---96901601698.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ipcrusud6ru1lhmjb8kb53nj31/wawij.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073023b832fa---75171525079.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_off0000cdf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDF3	17788 bytes
SHA-256: `06bda77039876b3117db2409c1a7430b0e2c85d3b9ee9696a89c852a7d351da5`
`font_01_sfnt_off0000fd01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD01	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011518.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11518	11016 bytes
SHA-256: `eb93270cce97af925890e89f7101ce7f63658d55719020ca945fecb977f5cbd8`

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