PDF malware analysis — malicious · da9f9d02047f505c

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 08:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9cb835e72230ff8d0bf7a1622e3cb786 SHA-1: 405a5d8caddb906783e0523947a6e32a935d6a8b SHA-256: da9f9d02047f505c09294fc0e4a8d6b6b192f31bbbbde51d3f980a90591714fc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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 https://garglob.ru/uplcv?utm_term=amour+conjugation+french PDF link annotation
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd58be94a45deadf7c0016c4e541d1d5/gifobepufubojepepetela.pdfIn PDF document text
- https://dgaspcsm.ro/ckfinder/userfiles/files/kudesuwina.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ma5653p4e50vjbn1snlpmu9ioi/baxiju.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0e40847433cb31f1bef2ee37fb701b16/79288284143.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855abee7dec---49238573003.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/29kha8vrbbbht8hd86tqrtqag0/22760643327.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qkdjd3nold8vag7fr08c388drg/58987063998.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/vivogufidogo.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9ec98de66cdc84759d46ac4377f34488/tiregidibufavot.pdfIn PDF document text
- https://paulins.se/anvandarbilder/178/files/xafuketeve.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9830b8bb57---gapulik.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088417ec93bc---5575546917.pdfIn PDF document text
- http://pixel-pro.ru/upload/file/punogodulaze.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6s6u5chb5gjjnajnmmlv32t6k0/xeponugegubeja.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e9e9ee566997fff343cb22f695222378/jatiduvukoxefumak.pdfIn PDF document text
- http://compsult.net/userfiles/file/7164846776.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/3078631737.pdfIn PDF document text
- http://adveotec.com/img/file/68542402697.pdfIn PDF document text
- https://ivaco.it/file/83643806244.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0539a1ccb---45692413852.pdfIn PDF document text
- http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/33251934952.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d31e50541---firijazodowe.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085485972e29---87829248063.pdfIn PDF document text
- http://energy-labels.com/userfiles/file/49945733677.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB66	18640 bytes
SHA-256: `63c1dcd835d753eac78bb2f18639702acb5f95fc0f04bdfbfac8c2355d84c99c`
`font_01_sfnt_off00011a48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013259.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13259	16216 bytes
SHA-256: `9645813dfe0e095ba24dc43757be082e08184fe9ddc661408a11b6d60d842c35`
`font_03_sfnt_off00014816.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14816	10780 bytes
SHA-256: `3a6a473279f0ba5f6c296991bd43a70f434761975db3c3eedf14fbd295720ff8`

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